Allegheny County, Pennsylvania

{{more citations needed|section|date = January 2019}}

File:Darlington map of Pennsylvania 1680.png and Allegheny County from the Darlington Collection]]

File:AlleghenyCtyCourthouse-082904.jpg]]

Prior to European contact, this area was settled for thousands of years by succeeding cultures of indigenous peoples. During the colonial era, historic native groups known by the colonists to settle in the area included members of western nations of the Iroquois, such as the Seneca; the Lenape, who had been pushed from the East by European-American settlers; the Shawnee, who also had territory in Ohio; and the Mingo, a group made up of a variety of peoples from more eastern tribes.

European fur traders such as Peter Chartier established trading posts in the region in the early eighteenth century.

In 1749, Captain Pierre Joseph Céloron de Blainville claimed the Ohio Valley and all of western Pennsylvania for King Louis XV of France. The captain traveled along the Ohio and Allegheny rivers. He installed lead plates in the ground to mark the land for France.

Most of the towns during that era were developed along waterways, which were the primary transportation routes, as well as providing water for domestic uses. Through the eighteenth century, both the French and the British competed for control over the local rivers in this frontier territory of North America. Native American bands and tribes allied with the colonists to differing degrees, often based on their trading relationships. The British sent Major George Washington to expel the French from their posts, with no success. He also nearly drowned in the ice-filled Allegheny River while returning to camp.

The English tried again in 1754 to establish a post in the area. They sent 41 Virginians to build Fort Prince George. The French learned of the plan and sent an army to capture the fort. They resumed building it and added increased defensive fortification, renaming it as Fort Duquesne.

Given its strategic location at the Ohio, Fort Duquesne became an important focal point of the French and Indian War. The first British attempt to retake the fort, the Braddock Expedition, failed miserably.Fiske, John (1902). [https://archive.org/details/newfranceandnew01fiskgoog/page/n334 New France and New England], pp. 290–92. Houghton Mifflin Company. In 1758 British forces under General John Forbes recaptured the fort; he had it destroyed to prevent any use by the French. The British built a new, larger fort on the site, including a moat, and named it Fort Pitt. The historic site has been preserved as Pittsburgh's Point State Park.

Under their colonial charters, both Pennsylvania and Virginia claimed the region that is now Allegheny County. Pennsylvania administered most of the region as part of its Westmoreland County. Virginia considered everything south of the Ohio River and east of the Allegheny River to be part of its Yohogania County, and governed it from Fort Dunmore. In addition, parts of the county were located in the proposed British colony of Vandalia and the proposed U.S. state of Westsylvania. The overlapping boundaries, multiple governments, and confused deed claims soon proved unworkable. Near the end of the American Revolutionary War, in 1780 Pennsylvania and Virginia agreed to extend the Mason–Dixon line westward. This region was assigned to Pennsylvania. From 1781 until 1788, much of what Virginia had claimed as part of Yohogania County was administered as a part of the newly created Washington County, Pennsylvania.

Allegheny County was officially created on September 24, 1788, from parts of Washington and Westmoreland counties. It was formed to respond to pressure from the increase in settlers living in the area around Pittsburgh; this was designated as the county seat in 1791. The county originally extended north to the shores of Lake Erie; it was reduced to its current borders by 1800. As population increased in the territory, other counties were organized.

In the 1790s, the United States federal government imposed a whiskey excise tax. Farmers who had depended on whiskey income refused to pay and started the so-called Whiskey Rebellion after driving off tax collector John Neville. After a series of demonstrations by farmers, President George Washington sent troops to suppress the frontier rebellion.

The area developed rapidly through the 1800s with industrialization. It became the nation's prime steel producer by the late 19th century and Pittsburgh was nicknamed "Steel Capital of the World".

In 1913, the county's 125th anniversary was celebrated with a week-long series of events. The final day, September 27, was marked by a steamboat parade of 30 paddle wheelers. They traveled from Monongahela Wharf down the Ohio to the Davis Island Dam. The boats in line were the Steel City (formerly the Pittsburgh and Cincinnati packet Virginia), the flag ship; City of Parkersburg, Charles Brown, Alice Brown, Exporter, Sam Brown, Boaz, Raymond Horner, Swan, Sunshine, I. C. Woodward, Cruiser, Volunteer, A. R. Budd, J. C. Risher, Clyde, Rival, Voyager, Jim Brown, Rover, Charlie Clarke, Robt. J. Jenkins, Slipper, Bertha, Midland Sam Barnum, Cadet, Twilight, and Troubadour.{{cite news |last1=Kussart |first1=Mrs. S. |title=Navigation on the Monongahela River|url=https://www.newspapers.com/image/53292243/ |access-date=August 10, 2018 |publisher=The Daily Republican (Monongahela, Pennsylvania) |date=April 24, 1930 |page=3 }}

According to the U.S. Census Bureau, the county has a total area of {{convert|745|sqmi}}, of which {{convert|730|sqmi}} is land and {{convert|14|sqmi}} (1.9%) is water.{{cite web|url=http://www2.census.gov/geo/docs/maps-data/data/gazetteer/counties_list_42.txt|publisher=United States Census Bureau|access-date=March 4, 2015|date=August 22, 2012|title=2010 Census Gazetteer Files}}

Four major rivers traverse Allegheny County: the Allegheny River and the Monongahela River converge at Downtown Pittsburgh to form the Ohio River. The Youghiogheny River flows into the Monongahela River at McKeesport, {{convert|10|mi|km}} to the southeast. There are several islands in these courses. The rivers drain via the Mississippi River into the Gulf of Mexico. Although the county's industrial growth resulted in clearcutting of the area's forests, a significant amount of woodland has regrown.

• Butler County (north)
• Armstrong County (northeast)
• Westmoreland County (east and south)
• Washington County (southwest)
• Beaver County (northwest)

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• {{jct|state=PA|I|76|PATP}}
• {{jct|state=PA|I|79}}
• {{jct|state=PA|I|279}}
• {{jct|state=PA|I|376}}
• {{jct|state=PA|BL|376}}
• {{jct|state=PA|I|579}}
• {{jct|state=PA|US|19}}
• {{jct|state=PA|US|22}}
• {{jct|state=PA|US-Bus|22|dab1=Monroeville}}
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• {{jct|state=PA|PA|380}}
• {{jct|state=PA|Toll|576}}
• {{jct|state=PA|PA|791}}
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• {{jct|state=PA|PA|910}}
• {{jct|state=PA|PA|978}}
• {{jct|state=PA|PA|980}}

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Allegheny has a humid continental climate which is hot-summer, (Dfa) except in higher elevations, where it is warm-summer (Dfb).

{{Pittsburgh weatherbox}}

File:Allegheny County Medical Examiner jeh.jpg

Until January 1, 2000, Allegheny County's government was defined under Pennsylvania's Second Class County Code. The county government was charged with all local activities, including elections, prisons, airports, public health, and city planning. All public offices were headed by elected citizens. There were three elected county commissioners.

On January 1, 2000, the Home-Rule Charter went into effect. It replaced the three elected commissioners with an elected chief officer (the County Executive), a county council with 15 members (13 elected by district, two elected county-wide), and an appointed county manager. The changes were intended to maintain a separation of powers between the executive and legislative branches while providing greater citizen control.

The county has 130 self-governing municipalities, the most in the state.{{cite web|url=http://alleghenycounty.wikidot.com/pittsburgh|title=City of Pittsburgh - Allegheny County Quest|website=alleghenycounty.wikidot.com|access-date=April 28, 2019}} (Luzerne is second with 76).{{cite web|url=http://www.pamunicipalitiesinfo.com|title=Pennsylvania Municipalities Information|publisher=Pamunicipalitiesinfo.com|access-date=August 16, 2012}} The county has one Second Class City (Pittsburgh) and three Third Class Cities (Clairton, Duquesne, and McKeesport).

A 2004 study found the county would be better served by consolidating the southeastern portion of the county (which includes many small communities with modest economies) into a large municipality ("Rivers City") with a combined population of approximately 250,000.{{cite news|url=https://web.archive.org/web/20201207184246/https://old.post-gazette.com/pg/04172/334816.stm|title=Can 39 towns be turned into one?|work=Pittsburgh Post-Gazette|date=June 20, 2004|access-date=December 7, 2020|first=Jeffrey|last=Cohan}}

Allegheny County has a Home Rule Charter form of government since 2000.{{cite web | url=https://ballotpedia.org/Government_of_Allegheny_County,_Pennsylvania | title=Government of Allegheny County, Pennsylvania }} The county has three branches: the executive, the legislative, and the judicial.{{Cite web|url=https://www.alleghenycounty.us/government/index.aspx|title=Government | Allegheny County|website=www.alleghenycounty.us}} The executive branch consists of the County Executive, who is elected for a four-year term and serves as the chief executive officer of the county; and the County Manager, who is appointed by the County Executive and oversees the daily operations of the county departments.{{cite web | url=https://www.alleghenycounty.us/government/elected-officials.aspx | title=Government | Elected Officials | Allegheny County }} The current County Executive is Sara Innamorato, a Democrat who took office in 2024.{{cite news |title=Innamorato sworn in as Allegheny County executive |url=https://www.wtae.com/article/sara-innamorato-swearing-in/46264829 |work=WTAE |date=January 2, 2024 |language=en}} The current County Manager is William D. McKain, who was appointed by Fitzgerald in 2012 and reappointed in 2016 and 2020. The legislative branch consists of the County Council, which is composed of 15 members elected for four-year terms from 13 single-member districts and 2 At-Large representatives, currently occupied by Bethany Hallam and Sam DeMarco. The council functions as the primary legislative and policy-making body of the county. The current County Council President is Patrick Catena, a Democrat who represents District 4 and was elected by his fellow council members in 2018 and 2020. The judicial branch consists of the Court of Common Pleas, which is the general trial court of the county; and the Magisterial District Courts, which are lower courts that handle minor criminal and civil cases. The judges of these courts are elected for ten-year terms. The current President Judge of the Court of Common Pleas is Kimberly Berkeley Clark, who was elected by her fellow judges in 2018 for a five-year term.

Allegheny County has 130 self-governing municipalities, the most in the state. These include one city (Pittsburgh), 96 boroughs, 30 townships, and two home rule municipalities (Bethel Park and McCandless).{{cite web | url=https://apps.alleghenycounty.us/website/munimap.asp | title=Allegheny County Municipality Map }}{{cite web | url=https://lwvpgh.org/content.aspx?page_id=22&club_id=554754&module_id=561094 | title=County government overview for Allegheny County, including county executive, county council, row offices, and the role of the Home Rule Charter - League of Women Voters of Greater Pittsburgh }}

Each municipality has its own elected officials, such as mayor, council, commissioners, supervisors, etc., and its own local services, such as police, fire, public works, etc.

Some municipalities also have their own municipal authorities that provide services such as water, sewer, transit, etc.{{cite web | url=https://alleghenytownship.net/municipal-authority/ | title=Municipal Authority • Allegheny Township, Westmoreland County, PA | date=March 22, 2022 }}

There have been several proposals to consolidate or merge some of the municipalities in Allegheny County, either with each other or with the City of Pittsburgh, to reduce costs, improve efficiency, and enhance regional cooperation. However, none of these proposals have been implemented so far.{{cite web | url=https://triblive.com/opinion/letter-to-the-editor-consolidation-sorely-needed-in-allegheny-county/ | title=Letter to the editor: Consolidation sorely needed in Allegheny County | date=February 7, 2022 }}{{cite journal | url=https://www.jstor.org/stable/1945587 | jstor=1945587 | title=City-County Consolidation in Allegheny County, Pennsylvania | last1=Egger | first1=Rowland A. | journal=The American Political Science Review | year=1929 | volume=23 | issue=1 | pages=121–123 | doi=10.2307/1945587 | s2cid=144275134 | url-access=subscription }} One of the most recent proposals is from Wilkinsburg, a borough that borders Pittsburgh and faces financial challenges due to declining population and tax base. In 2020, Wilkinsburg residents voted to approve a referendum to explore a merger with Pittsburgh. In 2021, a joint task force was formed to study the feasibility and impact of such a merger. The task force is expected to issue a report by June 2022. If both Wilkinsburg and Pittsburgh councils approve the merger, it would then need approval from the state legislature and governor before taking effect. Another recent proposal is from Allegheny County Economic Development (ACED), which is seeking to enter into an agreement with a consultant to carry out historic preservation compliance activities for projects funded by various federal programs. The consultant would help ACED develop a Programmatic Memorandum of Agreement (PMOA) with the Pennsylvania State Historic Preservation Office (SHPO) and other stakeholders to streamline the review process for projects that may affect historic properties within the county. ACED issued a Request for Proposals (RFP) for this service in January 2022 and expects to select a consultant by March 2022.{{Cite web|url=https://www.alleghenycounty.us/404.html?aspxerrorpath=/economic-development/docs/historic-consultant-rfp-2022-final-amended.aspx|title=Allegheny County | 404 Error|website=www.alleghenycounty.us}}

• Sara Innamorato (D)

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• Bethany Hallam (D), At-large Member
• Mike Embrescia (R), At-large Member
• Jack Betkowski (D), District 1
• Suzanne Filiaggi (R), District 2
• Anita Prizio (D), District 3
• Patrick Catena (D), President, District 4
• Dan Grzybek (D), District 5
• John F. Palmiere (D), Vice President, District 6
• Nicholas Futules (D), District 7
• Michelle Naccarati-Chapkis (D), District 8
• Robert J. Macey (D), District 9
• DeWitt Walton (D), District 10,
• Paul Klein (D), District 11
• Robert Palmosina (D), District 12
• Jordan Botta (D), District 13

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• Controller, Corey O'Connor (D) {{cite news |title=City councilman Corey O'Connor appointed as new Allegheny County Controller |url=https://www.cbsnews.com/pittsburgh/news/city-councilman-corey-oconnor-appointed-as-new-allegheny-county-controller/ |work=www.cbsnews.com}}
• District Attorney, Stephen A. Zappala Jr. (Forward)
• Sheriff, Kevin M. Kraus (D)
• Treasurer, Erica Rocchi Brusselars (D)

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File:Results of the 2020 Presidential Election in Allegheny County, PA.svg

{{PresHead|place=Allegheny County, Pennsylvania|source= }}

{{PresRow|2024|Democratic|283,595|429,916|10,288|Pennsylvania}}

{{PresRow|2020|Democratic|282,913|430,759|11,128|Pennsylvania}}

{{PresRow|2016|Democratic|259,480|367,617|30,092|Pennsylvania}}

{{PresRow|2012|Democratic|262,039|352,687|9,101|Pennsylvania}}

{{PresRow|2008|Democratic|272,347|373,153|8,539|Pennsylvania}}

{{PresRow|2004|Democratic|271,925|368,912|4,632|Pennsylvania}}

{{PresRow|2000|Democratic|235,361|329,963|17,154|Pennsylvania}}

{{PresRow|1996|Democratic|204,067|284,480|50,068|Pennsylvania}}

{{PresRow|1992|Democratic|183,035|324,004|107,148|Pennsylvania}}

{{PresRow|1988|Democratic|231,137|348,814|6,200|Pennsylvania}}

{{PresRow|1984|Democratic|284,692|372,576|8,480|Pennsylvania}}

{{PresRow|1980|Democratic|271,850|297,464|52,104|Pennsylvania}}

{{PresRow|1976|Democratic|303,127|328,343|16,387|Pennsylvania}}

{{PresRow|1972|Republican|371,737|282,496|14,302|Pennsylvania}}

{{PresRow|1968|Democratic|264,790|364,906|84,121|Pennsylvania}}

{{PresRow|1964|Democratic|241,707|475,207|2,811|Pennsylvania}}

{{PresRow|1960|Democratic|320,970|428,455|1,293|Pennsylvania}}

{{PresRow|1956|Republican|384,939|315,989|1,102|Pennsylvania}}

{{PresRow|1952|Democratic|359,224|370,945|2,903|Pennsylvania}}

{{PresRow|1948|Democratic|253,272|326,303|14,931|Pennsylvania}}

{{PresRow|1944|Democratic|261,218|350,690|2,393|Pennsylvania}}

{{PresRow|1940|Democratic|263,285|367,926|2,987|Pennsylvania}}

{{PresRow|1936|Democratic|176,224|366,593|19,377|Pennsylvania}}

{{PresRow|1932|Democratic|152,326|189,839|16,838|Pennsylvania}}

{{PresRow|1928|Republican|215,626|160,733|2,850|Pennsylvania}}

{{PresRow|1924|Republican|149,296|21,984|81,733|Pennsylvania}}

{{PresRow|1920|Republican|138,908|40,278|21,530|Pennsylvania}}

{{PresRow|1916|Republican|77,483|52,833|9,948|Pennsylvania}}

{{PresRow|1912|Progressive|23,822|31,417|71,147|Pennsylvania}}

{{PresRow|1908|Republican|74,080|35,655|12,170|Pennsylvania}}

{{PresRow|1904|Republican|90,594|21,541|6,270|Pennsylvania}}

{{PresRow|1900|Republican|71,780|27,311|3,533|Pennsylvania}}

{{PresRow|1896|Republican|76,691|29,809|1,674|Pennsylvania}}

{{PresRow|1892|Republican|45,788|30,867|1,849|Pennsylvania}}

{{PresRow|1888|Republican|45,118|24,710|1,138|Pennsylvania}}

{{PresRow|1884|Republican|37,865|19,469|3,774|Pennsylvania}}

{{PresRow|1880|Republican|35,539|22,096|1,747|Pennsylvania}}

|}

{{As of|2025|05|19|post=,}} there were 908,024 registered voters in the county; a majority were Democrats. There were 499,711 registered Democrats, 264,342 registered Republicans, 106,334 registered as independents and 37,637 registered with other parties.{{cite web |author1=Pennsylvania Department of State |author1-link=Pennsylvania Department of State |date=May 19, 2025 |title=Voter registration statistics by county |url=https://www.pa.gov/content/dam/copapwp-pagov/en/dos/resources/voting-and-elections/voting-and-election-statistics/currentvotestats.xls |access-date=May 19, 2025 |website=pa.gov}}

{{Pie chart

| thumb = left

| radius = 110

| caption= Chart of voter registration

| label1 = Democratic

| value1 = 55.03

| color1 = {{party color|Democratic Party (United States)}}

| label2 = Republican

| value2 = 29.11

| color2 = {{party color|Republican Party (United States)}}

| label3 = Independent

| value3 = 11.71

| color3 = {{party color|Independent (United States)}}

| label4 = Other parties

| value4 = 4.14

| color4 = {{party color|Green Party (United States)}}

}}

The Republican Party had been historically dominant in county-level politics in the 19th and early 20th centuries; prior to the Great Depression, Pittsburgh and Allegheny County had been majority Republican. Since the Great Depression on the state and national levels, the Democratic Party has been dominant in county-level politics. It is by far the most Democratic county in western Pennsylvania. For much of the time between the Great Depression and the turn of the millennium, it was the second-strongest Democratic bastion in Pennsylvania, behind only Philadelphia.

In 2000, Democrat Al Gore won 56% of the vote and Republican George W. Bush won 41%. In 2004, Democrat John Kerry received 57% of the vote and Republican Bush received 41%. In 2006, Democrats Governor Ed Rendell and Senator Bob Casey Jr. won 59% and 65% of the vote in Allegheny County, respectively. In 2008, Democrat Barack Obama received 57% of the vote, Republican John McCain received 41%, and each of the three state row office winners (Rob McCord for Treasurer, Jack Wagner for Auditor General, and Tom Corbett for Attorney General) also carried Allegheny. In 2016, despite Donald Trump being the first Republican to carry Pennsylvania since 1988, Hillary Clinton did slightly better than Barack Obama's 2012 vote total while Donald Trump was the worst performing Republican in 20 years. In the 2018 Midterms, Democrats received an even higher percentage of the vote with Tom Wolf and Casey receiving approximately two thirds of the county's vote.{{cite web|url=https://electionreturns.pa.gov/General/SummaryResults?ElectionID=63&ElectionType=G&IsActive=1|title=Pennsylvania Elections - Summary Results|website=electionreturns.pa.gov}}{{cite web |url=https://electionreturns.pa.gov/General/SummaryResults?ElectionID=63&ElectionType=G&IsActive=0 |title=2018 General Election Official Returns |date=November 6, 2018 |publisher=Pennsylvania Department of State |access-date=October 3, 2019 }} This is an improvement over the approximately 55% each person received in the county in their last election in 2014 and 2012 respectively. In 2020, Joe Biden improved upon Clinton's performance, receiving the highest vote percentage for a Democrat since Michael Dukakis in 1988 and the most votes for a Democrat since Lyndon B. Johnson in 1964.

In the 21st century, populist turns to the GOP from nearly all of Appalachia in general and western Pennsylvania in particular have left the county as one of the few in the region that still supports the Democrats at a high level.

Source{{cite web |url=https://www.legis.state.pa.us/cfdocs/legis/home/member_information/mbrList.cfm?body=H |title=Members of the House |work=PA House of Representatives |publisher= |access-date=November 13, 2021}}

{{div col}}

• Aerion Abney, Democratic, 19th district
• Emily Kinkead, Democratic, 20th district
• Lindsay Powell, Democratic, 21st district
• Dan Frankel, Democratic, 23rd district
• La'Tasha Mayes, Democratic, 24th district
• Brandon Markosek, Democratic, 25th district
• Daniel J. Deasy, Democratic, 27th district
• Rob Mercuri, Republican, 28th district
• Arvind Venkat, Democratic, 30th district
• Joe McAndrew, Democratic, 32nd district
• Mandy Steele, Democratic, 33rd district
• Abigail Salisbury, Democratic, 34th district
• Matt Gergely, Democratic, 35th district
• Jessica Benham, Democratic, 36th district
• Nick Pisciottano, Democratic, 38th district
• Andrew Kuzma, Republican, 39th district
• Natalie Mihalek, Republican, 40th district
• Dan L. Miller, Democratic, 42nd district
• Valerie Gaydos, Republican, 44th district
• Anita Astorino Kulik, Democratic, 45th district
• Jason Ortitay, Republican, 46th district

{{div col end}}

{{div col}}

• Devlin Robinson, Republican, 37th district
• Lindsey Williams, Democrat, 38th district
• Wayne D. Fontana, Democrat, 42nd district
• Jay Costa, Democrat, 43rd district
• James Brewster, Democrat, 45th district

{{div col end}}

• Chris Deluzio, Democrat, 17th district
• Summer Lee, Democrat, 12th district

===U.S. senators===

• John Fetterman, Democrat
• Dave McCormick, Republican

• John Fetterman, Democratic
• Dave McCormick, Republican

{{U.S. SenHead|place=Allegheny County, Pennsylvania|Seat=|source={{cite news |title=2024 Senate Election (Official Returns) |website=Commonwealth of Pennsylvania by county |date=November 5, 2024 |access-date=December 5, 2024 |url=https://www.nbcnews.com/politics/2024-elections/pennsylvania-senate-results}}}}

{{U.S. SenRow|2024|Democratic|272,861|425,280|17,781|Pennsylvania}}

{{U.S. SenFoot}}

In 2010 statistics, the largest religious group in Allegheny County was the Roman Catholic Diocese of Pittsburgh, with 460,672 Catholics worshipping at 179 parishes; followed by the United Methodist Church, with 44,204 Methodists in 100 congregations; the Presbyterian Church in the United States of America, with 42,838 Presbyterians in 145 congregations; non-denominational Protestants, with 33,103 adherents in 85 congregations; the Evangelical Lutheran Church in America, with 24,718 Lutherans in 77 congregations; the American Baptist Churches USA, with 17,148 Baptists in 42 congregations; the Assemblies of God, with 12,398 Pentecostals in 30 congregations; Reform Judaism, with 8,483 Jews in 6 congregations; the 7,780 Episcopal Church (United States), with 7,780 Episcopalians in 19 congregations; and Hinduism in the United States, with 6,700 Hindus in four temples. Altogether, 60.6% of the population was claimed as members by religious congregations, although members of historically African-American denominations were underrepresented due to incomplete information.{{cite web | title = County Membership Report Allegheny County (Pennsylvania) | url = http://www.thearda.com/rcms2010/rcms2010A.asp?U=42003&T=county&Y=2010&S=adh | website = The Association of Religion Data Archives | date = 2010 | access-date = January 2, 2020}} In 2014, Allegheny County had 794 religious organizations, the 11th most out of all US counties.{{cite web | title = Social Capital Variables Spreadsheet for 2014 | url = https://aese.psu.edu/nercrd/community/social-capital-resources/social-capital-variables-for-2014/social-capital-variables-spreadsheet-for-2014 | website = PennState College of Agricultural Sciences, Northeast Regional Center for Rural Development | date = December 8, 2017 | access-date = December 30, 2019 | archive-date = December 31, 2019 | archive-url = https://web.archive.org/web/20191231001016/https://aese.psu.edu/nercrd/community/social-capital-resources/social-capital-variables-for-2014/social-capital-variables-spreadsheet-for-2014 | url-status = dead }}

{{US Census population

| 1790 = 10203

| 1800 = 15087

| 1810 = 25317

| 1820 = 34921

| 1830 = 50552

| 1840 = 81235

| 1850 = 138290

| 1860 = 178831

| 1870 = 262204

| 1880 = 355869

| 1890 = 551959

| 1900 = 775058

| 1910 = 1018463

| 1920 = 1185808

| 1930 = 1374410

| 1940 = 1411539

| 1950 = 1515237

| 1960 = 1628587

| 1970 = 1605016

| 1980 = 1450085

| 1990 = 1336449

| 2000 = 1281666

| 2010 = 1223348

| 2020 = 1250578

| estyear = 2023

| estimate = 1224825

| estref =

| align-fn = center

| footnote = U.S. Decennial Census{{cite web|url=https://www.census.gov/programs-surveys/decennial-census.html|title=U.S. Decennial Census|publisher=United States Census Bureau|access-date=August 12, 2021}}
1790–1960{{cite web|url=http://mapserver.lib.virginia.edu|title=Historical Census Browser|publisher=University of Virginia Library|access-date=March 4, 2015}} 1900–1990{{cite web|url=https://www.census.gov/population/cencounts/pa190090.txt|title=Population of Counties by Decennial Census: 1900 to 1990|publisher=United States Census Bureau|editor-last=Forstall|editor-first=Richard L.|date=March 27, 1995|access-date=March 4, 2015}}
1990–2000{{cite web|url=https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-url=https://ghostarchive.org/archive/20221009/https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-date=October 9, 2022 |url-status=live|title=Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000|publisher=United States Census Bureau|date=April 2, 2001|access-date=March 4, 2015}} 2010–2018{{cite web|title=State & County QuickFacts|url=http://quickfacts.census.gov/qfd/states/42/42003.html|publisher=United States Census Bureau|access-date=November 16, 2013|url-status=dead|archive-url=https://web.archive.org/web/20110703083639/http://quickfacts.census.gov/qfd/states/42/42003.html|archive-date=July 3, 2011}}

}}

{{Cite web |title=County Population Totals and Components of Change: 2020-2023 |url=https://www.census.gov/data/tables/time-series/demo/popest/2020s-counties-total.html |access-date=March 29, 2024 |website=Census.gov}}

As of the 2010 census, there were 1,223,348 people living in the county. The population density was {{convert|1676|/mi2|/km2|disp=preunit|people |people}}. The racial makeup of the county was 82.87% White, 14.39% Black or African American, 2.94% Asian, 0.03% Pacific Islander, 0.37% from other races, and 1.40% from two or more races. About 1.31% of the population were Hispanic or Latino of any race.

At the 2000 census,{{cite web|url=https://www.census.gov|publisher=United States Census Bureau|access-date=January 31, 2008|title=U.S. Census website}} there were 1,281,666 people, 537,150 households, and 332,495 families living in the county. The population density was {{convert|1,755|/mi2|/km2|disp=preunit|people |people}}. There were 583,646 housing units at an average density of {{convert|799|/mi2|/km2}}. The racial makeup of the county was 84.33% White, 12.41% Black or African American, 0.12% Native American, 1.69% Asian, 0.03% Pacific Islander, 0.34% from other races, and 1.07% from two or more races. About 0.87% of the population were Hispanic or Latino of any race. 20.0% were of German, 15.0% Italian, 12.7% Irish, 7.5% Polish and 5.1% English ancestry. 93.5% spoke English and 1.3% Spanish as their first language.

There were 537,150 households, out of which 26.40% had children under the age of 18 living with them, 46.10% were married couples living together, 12.40% had a female householder with no husband present, and 38.10% were non-families. Some 32.70% of all households were made up of individuals, and 13.20% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.96.

The age distribution of the population shows 21.90% under the age of 18, 8.50% from 18 to 24, 28.30% from 25 to 44, 23.40% from 45 to 64, and 17.80% who were 65 years of age or older. The median age was 40. For every 100 females, there were 90.00 males; for every 100 females age 18 and over, there were 86.20 males.

{{see also|Economy of Pittsburgh}}

In the late 18th century, farming played a critical role in the growth of the area. There was a surplus of grain due to transportation difficulties in linking with the eastern portion of the state. As a result, the farmers distilled the grain into whiskey, which significantly helped the farmers financially.

File:Tree Map of Employment by Occupations in Allegheny County, Pa (2015).svg

The area quickly became a key manufacturing area in the young nation. Coupled with deposits of iron and coal, and the easy access to waterways for barge traffic, the city quickly became one of the most important steel producing areas in the world. Based on 2007 data from the US Army Corps of Engineers, Pittsburgh is the second (after Laredo, Texas) busiest inland port in the nation.

US steel production declined late in the 20th century, and Allegheny County's economy began a shift to other industries. It is presently known for its hospitals, universities, and industrial centers. Despite the decline of heavy industry, Pittsburgh is home to a number of major companies and is ranked in the [https://web.archive.org/web/20070630105614/http://www.downtownpittsburgh.com/doingBusinessDowntown.aspx top ten] among US cities hosting headquarters of Fortune 500 corporations, including U.S. Steel Corporation, PNC Financial Services Group, PPG Industries, and H. J. Heinz Company.

The county leads the state in number of defense contractors supplying the U.S. military.{{cite news|url=http://www.post-gazette.com/pg/11338/1194201-455-0.stm|title=Automatic defense cuts would affect some contractors in Pittsburgh region|work=Pittsburgh Post-Gazette|date=July 3, 2012|access-date=August 16, 2012}}

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• East Hills
• North Hills
• South Hills
• West Hills
• City of Pittsburgh

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• Byzantine Catholic Seminary of SS. Cyril and Methodius
• Carlow University
• Carnegie Mellon University
• Chatham University
• DeVry University
• Duquesne University
• La Roche University
• Penn State Greater Allegheny
• Pittsburgh Theological Seminary
• Point Park University
• Reformed Presbyterian Theological Seminary
• Robert Morris University
• University of Pittsburgh

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• Bidwell Training Center
• Community College of Allegheny County
• Empire Beauty Schools
• Fountain of Youth Academy of Cosmetology
• Institute of Medical and Business Careers
• North Hills Beauty Academy
• Pittsburgh Career Institute
• Pittsburgh Institute of Aeronautics
• Pittsburgh Institute of Mortuary Science
• Pittsburgh Multicultural Cosmetology Academy
• Pittsburgh Technical College
• Rosedale Technical College
• South Hills Beauty Academy
• Triangle Tech
• Vet Tech Institute

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File:Map of Allegheny County Pennsylvania School Districts.png

School districts include:{{cite web|url=https://www2.census.gov/geo/maps/DC2020/PL20/st42_pa/schooldistrict_maps/c42003_allegheny/DC20SD_C42003.pdf |archive-url=https://ghostarchive.org/archive/20221009/https://www2.census.gov/geo/maps/DC2020/PL20/st42_pa/schooldistrict_maps/c42003_allegheny/DC20SD_C42003.pdf |archive-date=October 9, 2022 |url-status=live|title=2020 census - school district reference map: Allegheny County, PA|publisher=U.S. Census Bureau|access-date=July 20, 2022}} - [https://www2.census.gov/geo/maps/DC2020/PL20/st42_pa/schooldistrict_maps/c42003_allegheny/DC20SD_C42003_SD2MS.txt Text list]

These private schools provide special education for disabled students:

• ACLD Tillotson School, Pittsburgh
• The Day School at The Children's Institute, Pittsburgh
• DePaul School for Hearing and Speech, Pittsburgh
• Easter Seal Society of Western Pennsylvania
• The Education Center at the Watson Institute, Sewickley
• Pace School, Pittsburgh
• Pressley Ridge Day School, Pittsburgh
• Pressley Ridge School for the Deaf, Pittsburgh
• The Watson Institute Friendship Academy, Pittsburgh
• Wesley Spectrum Highland Services, Pittsburgh
• Western Pennsylvania School for Blind Children, Pittsburgh
• Western Pennsylvania School for the Deaf, Pittsburgh

{{div col|colwidth=22em}}

• Bishop Canevin High School
• Central Catholic High School
• Cornerstone Christian Preparatory Academy
• Eden Christian Academy
• The Ellis School
• Hillcrest Christian Academy
• Harvest Baptist Academy
• Imani Christian Academy
• Oakland Catholic High School
• Our Lady of the Sacred Heart High School
• Serra Catholic High School
• Seton-La Salle Catholic High School
• Sewickley Academy
• Shady Side Academy
• St. Joseph High School
• Vincentian Academy
• Winchester Thurston School

{{div col end}}

Allegheny County's public transportation provider is Pittsburgh Regional Transit. The Allegheny County Department of Public Works oversees infrastructure, maintenance, and engineering services in the county.

The Three Rivers Heritage Trail provides uninterrupted bicycle and pedestrian connections along the three rivers in the city, and the Great Allegheny Passage trail runs from downtown Pittsburgh to Washington, D.C.

The Allegheny County Airport is the original airport for Pittsburgh and houses a number of flight schools, charter flight operations, and medevac operations. It is owned and operated by The Allegheny County Airport Authority.

Pittsburgh International Airport is the major passenger airport for the county with service to many destinations on several airlines. Like the Allegheny County Airport, it is also owned and operated by The Allegheny County Airport Authority.

• File:I-79 (PA).svg Interstate 79 runs north to south from Warrendale to Bridgeville
• File:I-279 (PA).svg Interstate 279 runs north to south from Franklin Park to Downtown
• File:I-579 (PA).svg Interstate 579 (Crosstown Boulevard), from Interstate 279 on the north shore to Liberty Bridge / Boulevard of the Allies
• File:I-76 (PA).svg File:Pennsylvania Turnpike logo.svg Interstate 76 / PA Turnpike runs east to west from Interstate 376 in Monroeville to the Warrendale interchange (at Interstate 79)
• File:I-376 (PA).svg Interstate 376 runs east to west from Interstate 76 in Monroeville across the county to Pittsburgh International Airport and beyond
• File:Turnpike-576.svg Pennsylvania Turnpike 576 (future I-576) runs south from Interstate 376 at the Pittsburgh International Airport to US Route 22, also called the Findlay Connector. The next phase of this road extension, from US Route 22 to Interstate 79 running along the County line, is currently under construction and is expected to be open to traffic in 2020.
• File:US 19.svg US Route 19 runs north to south from Warrendale to Upper St. Clair
• File:US 22.svg US Route 22 runs west to east, along much of US Route 30 and Interstate 376, from Imperial to Monroeville
• File:US 30.svg US Route 30 runs west to east from Clinton to North Versailles, joining US 22 and Interstate 376 south of the Pittsburgh International Airport and leaving those same two routes in Wilkinsburg

For information about major state roads, see list of state routes in Allegheny County, Pennsylvania and Allegheny County Belt System.

There are two Pennsylvania state parks in Allegheny County. Point State Park is at the confluence of the Allegheny and Monongahela rivers in Downtown Pittsburgh, and Allegheny Islands State Park is in the Allegheny River in Harmar Township and is undeveloped as of August 2010.

Pennsylvania State Game Lands Number 203 is also located in Allegheny County providing hunting and other activities.

Allegheny Land Trust, a regional land conservation group headquartered in Sewickley, has purchased land in Allegheny County for use as public green spaces for scenic and recreational purposes.{{Cite web |last=Panizzi |first=Tawnya |date=April 8, 2021 |title=Allegheny Land Trust finalizes purchase of Girty's Woods in Reserve, shielding 155-acre forest from development |url=https://triblive.com/local/allegheny-land-trust-finalizes-purchase-of-girtys-woods-in-reserve-shielding-155-acre-forest-from-development/ |access-date=February 1, 2024 |website=TribLIVE.com |language=en-US}}{{Cite news |last=Phox |first=Jason |date=February 16, 2023 |title=Allegheny Land Trust acquires more than 120 acres as protected green space |url=http://nextpittsburgh.com/environment/allegheny-land-trust-adds-more-than-120-acres-to-countywide-green-spaces/ |access-date=February 1, 2024 |website=NEXTpittsburgh |language=en-US}} In 2012 it pursued land formerly owned by the Pittsburgh Cut Flower Company in Richland Township.{{cite news | author = Barron, Joanne | title = New director has big plans for Allegheny Land Trust| newspaper = Pittsburgh Trib Live |date=November 2012 | url=http://triblive.com/neighborhoods/yoursewickley/yoursewickleymore/2912541-87/alt-beichner-director-development-organization-acres-executive-community-conservation-mwcdc#ixzz2DHayw326 }} In 2020, it received a grant to convert a former country club into a public green space.{{Cite web |last=Waltz |first=Amanda |title=Allegheny Land Trust awarded grant to transform former country club into public green space |url=https://www.pghcitypaper.com/news/allegheny-land-trust-awarded-grant-to-transform-former-country-club-into-public-green-space-18210102 |date=October 19, 2020 |access-date=February 1, 2024 |website=Pittsburgh City Paper |language=en}}{{Cite web |last1=Cipriani |first1=Marcie |date=November 26, 2019 |title=$500,000 grant announced to help Allegheny Land Trust purchase former Churchill Valley Country Club |url=https://www.wtae.com/article/dollar500000-grant-announced-to-help-allegheny-land-trust-purchase-former-churchill-valley-country-club/29962831 |access-date=February 1, 2024 |website=WTAE |language=en}} In December 2020, it donated 20 undeveloped acres across three parcels in Hampton to expand North Park.{{Cite news|title=Donation to add acreage to North Park in Hampton|url=https://www.post-gazette.com/local/north/2020/12/15/North-Park-Allegheny-County-Council-Allegheny-Land-Trust-Hampton-donation-Roy-Kraynyk-Andy-Baechle/stories/202012150121|access-date=December 28, 2020|website=Pittsburgh Post-Gazette|language=en}}{{AlleghenyCountyPennsylvaniaParks}}

• Pittsburgh Steelers, football team
• Pittsburgh Penguins, ice hockey team
• Pittsburgh Pirates, baseball team
• Pittsburgh Riverhounds, soccer team
• Pittsburgh Passion, Women's Football Alliance team
• Pittsburgh Thunderbirds, American Ultimate Disc League team
• Steel City Roller Derby, Women's Flat Track Derby Association team

File:Map of Allegheny County Pennsylvania With Municipal and Township Labels.png

Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and (in a case) a town. The following municipalities are in Allegheny County:

• Clairton
• Duquesne
• McKeesport
• Pittsburgh (county seat)

{{div col|colwidth=18em}}

• Aspinwall
• Avalon
• Baldwin
• Bell Acres
• Bellevue
• Ben Avon
• Ben Avon Heights
• Bethel Park
• Blawnox
• Brackenridge
• Braddock
• Braddock Hills
• Bradford Woods
• Brentwood
• Bridgeville
• Carnegie
• Castle Shannon
• Chalfant
• Cheswick
• Churchill
• Coraopolis
• Crafton
• Dormont
• Dravosburg
• East McKeesport
• East Pittsburgh
• Edgewood
• Edgeworth
• Elizabeth
• Emsworth
• Etna
• Forest Hills
• Fox Chapel
• Franklin Park
• Glassport
• Glenfield
• Glen Osborne
• Green Tree
• Haysville
• Heidelberg
• Homestead
• Ingram
• Jefferson Hills
• Leetsdale
• Liberty
• Lincoln
• McDonald (mostly in Washington County)
• McKees Rocks
• Millvale
• Monroeville
• Mount Oliver
• Munhall
• North Braddock
• Oakdale
• Oakmont
• Pennsbury Village
• Pitcairn
• Pleasant Hills
• Plum
• Port Vue
• Rankin
• Rosslyn Farms
• Sewickley
• Sewickley Heights
• Sewickley Hills
• Sharpsburg
• Springdale
• Swissvale
• Tarentum
• Thornburg
• Trafford (mostly in Westmoreland County)
• Turtle Creek
• Verona
• Versailles
• Wall
• West Elizabeth
• West Homestead
• West Mifflin
• West View
• Whitaker
• White Oak
• Whitehall
• Wilkinsburg
• Wilmerding

{{div col end}}

{{div col|colwidth=15em}}

• Aleppo
• Baldwin
• Collier
• Crescent
• East Deer
• Elizabeth
• Fawn
• Findlay
• Forward
• Frazer
• Hampton
• Harmar
• Harrison
• Indiana
• Kennedy
• Kilbuck
• Leet
• Marshall
• McCandless
• Moon
• Mt. Lebanon
• Neville
• North Fayette
• North Versailles
• O'Hara
• Ohio
• Penn Hills
• Pine
• Reserve
• Richland
• Robinson
• Ross
• Scott
• Shaler
• South Fayette
• South Park
• South Versailles
• Springdale
• Stowe
• Upper Saint Clair
• West Deer
• Wilkins

{{div col end}}

Census-designated places are geographical areas designated by the US Census Bureau for the purposes of compiling demographic data. They are not actual jurisdictions under Pennsylvania law. Other unincorporated communities, such as villages, may be listed here as well.

{{div col|colwidth=15em}}

• Allison Park
• Bairdford
• Bakerstown
• Boston
• Carnot-Moon
• Clinton
• Curtisville
• Enlow
• Gibsonia
• Glenshaw
• Greenock
• Harwick
• Imperial
• Noblestown
• Rennerdale
• Russellton
• Sturgeon

{{div col end}}

{{div col|colwidth=15em}}

• Acmetonia
• Blackridge
• Blanchard
• Broughton
• Bruceton
• Buena Vista
• Creighton
• Cubbage Hill{{Cite news|last=Schmitz|first=Jon|title=Kirwan Heights loses Interstate 79 designation|newspaper=Pittsburgh Post-Gazette|date=July 23, 2012|url=http://www.post-gazette.com/stories/news/transportation/kirwan-heights-loses-i-79-designation-645098|access-date=May 15, 2016}}
• Cuddy{{cite web|url=https://www.mapquest.com/us/pa/cuddy-282096148|title=Profile: Cuddy, Pennsylvania|publisher=Mapquest|access-date=May 15, 2016}}
• Dorseyville
• Ewingsville
• Harmarville
• Indianola
• Ingomar
• Karns
• Keown Station
• Kirwan Heights
• Library
• McKnight
• Moon Run
• Mount Vernon
• Natrona
• Natrona Heights
• Nevillewood
• Presto
• Regent Square
• Rural Ridge
• Sheraden{{cite web|url=http://geonames.usgs.gov/apex/f?p=136:3:0::NO:3:P3_FID,P3_TITLE:1187475,Sheraden|title=Profile: Sheraden, Pennsylvania|publisher=U.S. Geological Survey|access-date=May 15, 2016}}
• Warrendale
• Wexford
• Wildwood

{{div col end}}

Many political subdivisions of Allegheny County have come and gone through subdivision or annexation through the years. These include:

• Allegheny City – the area that is now the North Shore (or North Side) of the City of Pittsburgh, north of the Allegheny River.
• Allentown Borough – now the neighborhood of Allentown in Pittsburgh.
• Birmingham Borough – what is now Pittsburgh's South Side.
• Brushton Borough
• Carrick Borough – now the neighborhood of Carrick. Formed out of Baldwin Township in 1904, this borough existed until it was annexed by Pittsburgh in 1927. It was named for Carrick-on-Suir, Ireland. Some of the area's manhole covers still bear the Carrick Borough name.
• Chartier Township – existed at the time of the 1860 U.S. Federal Census.[https://www.ancestry.com/interactive/7667/4282818_00072?pid=3065602 1860 United States Federal Census - Chartier Township], accessed April 2018 via ancestry.com paid subscription site.
• Collins Township – in what is now the northeast part of the City of Pittsburgh, east of Lawrenceville and north of Penn Avenue.
• Knoxville Borough
• Lawrenceville Borough
• McClure Township – McClure was formed in 1858 from the section of Ross Township adjacent to Allegheny City. In 1867 McClure, along with sections of Reserve Township, was incorporated into Allegheny City. The McClure section of this annexation became Wards 9 (Woods Run Area) and 11 (present-day Brighton Heights) in the City of Pittsburgh.
• Mifflin Township- comprised the modern day communities of Whitaker, West Mifflin, West Homestead, West Elizabeth, Pleasant Hills, Munhall, Lincoln Place, Jefferson Hills, Homestead, Hays, Duquesne, Dravosburg, Clairton and part of Baldwin.{{cite web|url=http://explorepahistory.com/attraction.php?id=1-B-307D|title=Mifflin Township Historical Society Attraction Details|publisher=ExplorePAhistory.com}}
• Patton Township – was in the east-central part of the county, north of North Versailles Township, east of Wilkins and Penn Townships, and south of Plum Township. In the U.S. census for 1860–1880. In 1951 it became incorporated as the borough of Monroeville.
• Northern Liberties Borough – in what is now the Strip District of Pittsburgh. The borough was annexed to Pittsburgh in 1837 as the first addition to the city's original territory.
• Peebles Township – included most of what is now the eastern part of the city of Pittsburgh from the Monongahela River in the south (today's Hazelwood) to the Allegheny River in the north. It was subdivided into Collins and Liberty townships, all of which were incorporated into Pittsburgh in 1868.
• Pitt Township
• St. Clair Township – stretched from the Monongahela River south to the Washington County line. It divided into Lower St. Clair, which eventually became part of the City of Pittsburgh, Dormont, Mount Lebanon, and Upper St. Clair.
• Snowden – now known as South Park Township.
• Sterrett Township
• Temperanceville – what is now Pittsburgh's West End.
• Union Borough – the area surrounding Temperanceville.
• West Liberty Borough – now the neighborhoods of Brookline and Beechview in Pittsburgh.

The population ranking of the following table is based on the 2010 census of Allegheny County.{{cite web|url=https://www.census.gov/programs-surveys/decennial-census/decade.2010.html|title=2010 Census|author=Center for New Media and Promotions(C2PO)|publisher=United States Census Bureau}}

† county seat

• List of Pennsylvania state historical markers in Allegheny County
• National Register of Historic Places listings in Allegheny County, Pennsylvania
• List of counties in Pennsylvania

{{notelist}}

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{{Wikivoyage|Allegheny County}}

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• [http://www.alleghenycounty.us Allegheny County official website]
• [http://alleghenycounty.wikidot.com Allegheny County Quest]
• [http://apps.alleghenycounty.us/website/MuniList.asp County Map by Municipality]
• [http://digital.library.pitt.edu/maps/ Historic Pittsburgh Map Collection]
• [http://www.spcregion.org/reg_all.shtml Southwestern Pennsylvania Commission] {{Webarchive|url=https://web.archive.org/web/20040901054342/http://www.spcregion.org/reg_all.shtml |date=September 1, 2004 }}

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Category:1788 establishments in Pennsylvania

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