Jefferson County, New York#Metropolitan Statistical Area

When counties were established in the Province of New York in 1683, the present Jefferson County was part of Albany County. This was an enormous county, including the northern part of New York State as well as all of the present State of Vermont and, in theory, extending westward to the Pacific Ocean. This county was reduced in size on July 3, 1766, by the creation of Cumberland County, and further on March 16, 1770, by the creation of Gloucester County, both containing territory now in Vermont.

On March 12, 1772, what was left of Albany County was split into three parts, one remaining under the name Albany County. One of the other pieces, Tryon County, contained the western portion (and thus, since no western boundary was specified, theoretically still extended west to the Pacific). The eastern boundary of Tryon County was approximately {{convert|5|mi|km}} west of the present city of Schenectady, and the county included the western part of the Adirondack Mountains and the area west of the West Branch of the Delaware River. The area then designated as Tryon County now includes 37 counties of New York State. The county was named for William Tryon, colonial governor of New York.

In the years subsequent to 1776, most of the Loyalists in Tryon County fled to Canada. In 1784, following the peace treaty that ended the American Revolutionary War, the name of Tryon County was changed to Montgomery County to honor the general, Richard Montgomery, who had captured several places in Canada and died attempting to capture the city of Quebec, replacing the name of the hated British governor.

In 1789, the size of Montgomery County was reduced by the creation of Ontario County from Montgomery. The area split off from Montgomery County was much larger than the present county, as it was later divided to form the present Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston, Monroe, Niagara, Orleans, Steuben, Wyoming, Yates, and parts of Schuyler and Wayne counties.

Jefferson County is part of Macomb's Purchase of 1791.

In 1791, Herkimer County was one of three counties split off from Montgomery (the other two being Otsego, and Tioga County). This was much larger than the present county, however, and was reduced by a number of subsequent splits. The first one of these, in 1794, produced Onondaga County. This county was larger than the current Onondaga County, including the present Cayuga and Cortland Counties, and part of Oswego County.

Oneida County (as well as a part of Chenango County), was split off from Herkimer County in 1798.

Jefferson County was split off from Oneida County in 1805. In 1817, Carleton Island, captured from the British in the War of 1812, was annexed to the county. During the late eighteenth and nineteenth centuries, the county was largely developed for agriculture.

By the early 20th centuries, Watertown was a city with the highest per capita number of millionaires in the United States. Local industrialists had made early fortunes from industries driven by water power. Mills were established along the falls of the Black River from the first half of the nineteenth century.

In 2019, Jefferson County and much of the rest of the North Country was identified as one of the most politically tolerant communities in America, according to an analysis by PredictWise.{{Cite news|url=https://www.theatlantic.com/politics/archive/2019/03/watertown-new-york-tops-scale-political-tolerance/582106/|title=The Least Politically Prejudiced Place in America|last=Ripley|first=Amanda|work=The Atlantic|access-date=March 5, 2019|issn=1072-7825|archive-date=March 5, 2019|archive-url=https://web.archive.org/web/20190305104903/https://www.theatlantic.com/politics/archive/2019/03/watertown-new-york-tops-scale-political-tolerance/582106/|url-status=live}}{{Cite web|url=https://www.theatlantic.com/politics/archive/2019/03/us-counties-vary-their-degree-partisan-prejudice/583072/|title=The Geography of Partisan Prejudice|last=He|first=Amanda Ripley, Rekha Tenjarla, Angela Y.|date=March 4, 2019|website=The Atlantic|language=en-US|access-date=March 5, 2019|archive-date=March 5, 2019|archive-url=https://web.archive.org/web/20190305153101/https://www.theatlantic.com/politics/archive/2019/03/us-counties-vary-their-degree-partisan-prejudice/583072/|url-status=live}}

According to the U.S. Census Bureau, the county has an area of {{convert|1857|sqmi}}, of which {{convert|1269|sqmi}} is land and {{convert|589|sqmi}} (32%) is water.{{cite web|url=https://www.census.gov/geo/maps-data/data/docs/gazetteer/counties_list_36.txt |publisher=United States Census Bureau |access-date=January 5, 2015 |date=August 22, 2012 |title=2010 Census Gazetteer Files |url-status=dead |archive-url=https://web.archive.org/web/20140519062322/http://www.census.gov/geo/maps-data/data/docs/gazetteer/counties_list_36.txt |archive-date=May 19, 2014 }} It is the fourth-largest county in New York by area.

Jefferson County is in New York State's northern lobe, adjacent to the area where the Saint Lawrence River exits Lake Ontario. It is northeast of Syracuse, and northwest of Utica. The county is at the international border with Canada.

The Black River, which empties into Lake Ontario, is an important waterway in the county. Part of the Tug Hill Plateau is in the southern part of the county. The county contains part of the Thousand Islands in the St. Lawrence River, including such large islands as Carleton Island, Grindstone Island, and Wellesley Island.

• St. Lawrence County – northeast
• Lewis County – southeast
• Oswego County – southwest
• Leeds and Grenville United Counties, Ontario – north
• Frontenac County, Ontario – northwest

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• 20px Interstate 81
• 22px Interstate 781
• 20px U.S. Route 11
• 20px New York State Route 3
• 20px New York State Route 3A
• 20px New York State Route 12
• 22px New York State Route 12E
• 22px New York State Route 12F
• 20px New York State Route 26
• 20px New York State Route 37
• 22px New York State Route 180

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{{US Census population

|1810= 15140

|1820= 32952

|1830= 48493

|1840= 60984

|1850= 68153

|1860= 69825

|1870= 65415

|1880= 66103

|1890= 68806

|1900= 76748

|1910= 80382

|1920= 82250

|1930= 83574

|1940= 84003

|1950= 85521

|1960= 87835

|1970= 88508

|1980= 88151

|1990= 110943

|2000= 111738

|2010= 116229

|2020= 116721

|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=January 5, 2015|archive-date=April 26, 2015|archive-url=https://web.archive.org/web/20150426102944/http://www.census.gov/prod/www/decennial.html|url-status=live}}
1790–1960{{cite web|url=http://mapserver.lib.virginia.edu|title=Historical Census Browser|publisher=University of Virginia Library|access-date=January 5, 2015|archive-date=August 11, 2012|archive-url=https://web.archive.org/web/20120811110448/http://mapserver.lib.virginia.edu/|url-status=live}} 1900–1990{{cite web|url=https://www.census.gov/population/cencounts/ny190090.txt|title=Population of Counties by Decennial Census: 1900 to 1990|publisher=United States Census Bureau|access-date=January 5, 2015|archive-date=February 19, 2015|archive-url=https://web.archive.org/web/20150219161259/http://www.census.gov/population/cencounts/ny190090.txt|url-status=live}}
1990–2000{{cite web|url=https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf|title=Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000|publisher=United States Census Bureau|access-date=January 5, 2015|archive-date=December 18, 2014|archive-url=https://web.archive.org/web/20141218203824/http://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf|url-status=live}} 2020

}}

As of the census{{cite web|url=https://www.census.gov|publisher=United States Census Bureau|access-date=January 31, 2008|title=U.S. Census website|archive-date=December 27, 1996|archive-url=https://web.archive.org/web/19961227012639/https://www.census.gov/|url-status=live}} of 2000, there were 111,738 people, 40,068 households, and 28,127 families residing in the county. The population density was {{convert|88|pd/sqmi}}. There were 54,070 housing units at an average density of {{convert|42|/mi2|/km2|adj=pre|units }}. The county's racial makeup was 88.71% White, 5.83% Black or African American, 0.53% Native American, 0.92% Asian, 0.14% Pacific Islander, 2.05% from other races, and 1.82% from two or more races. 4.19% of the population were Hispanic or Latino of any race. 93.2% spoke English and 3.5% Spanish as their first language.

21.9% were of English, 14.1% Irish, 12.8% German, 8.5% French and 8.5% Italian ancestry according to the 2010 American Community Survey.

There were 40,068 households, of which 37.20% had children under the age of 18 living with them, 55.60% were married couples living together, 10.40% had a female householder with no husband present, and 29.80% were non-families. 24.40% of all households were made up of individuals, and 10.10% had someone living alone who was 65 years of age or older. The average household size was 2.58 and the average family size was 3.07.

26.50% of the county's population was under age 18, 11.80% was from age 18 to 24, 31.30% was from age 25 to 44, 19.10% was from age 45 to 64, and 11.30% were age 65 or older. The median age was 32 years. For every 100 females there were 107.30 males. For every 100 females age 18 and over, there were 108.50 males.

The county's median household income was $34,006, and the median family income was $39,296. Males had a median income of $28,727 versus $21,787 for females. The county's per capita income was $16,202. About 10.00% of families and 13.30% of the population were below the poverty line, including 16.80% of those under age 18 and 9.20% of those age 65 or over.

Jefferson Community College in Watertown provides higher education within the county.

School districts include:{{cite web|url=https://www2.census.gov/geo/maps/DC2020/PL20/st36_ny/schooldistrict_maps/c36045_jefferson/DC20SD_C36045.pdf|title=2020 CENSUS - SCHOOL DISTRICT REFERENCE MAP: Jefferson County, NY|publisher=U.S. Census Bureau|access-date=2024-12-21}} - [https://www2.census.gov/geo/maps/DC2020/PL20/st36_ny/schooldistrict_maps/c36045_jefferson/DC20SD_C36045_SD2MS.txt Text list]

{{div col|colwidth=30em}}

• Alexandria Central School District
• Belleville Henderson Central School District
• Carthage Central School District
• Copenhagen Central School District
• General Brown Central School District
• Gouverneur Central School District
• Hammond Central School District
• Indian River Central School District
• La Fargeville Central School District
• Lyme Central School District
• Sackets Harbor Central School District
• Sandy Creek Central School District
• South Jefferson Central School District
• Thousand Islands Central School District
• Watertown City School District

{{div col end}}

Some areas on Fort Drum are not in any school district.{{cite web|url=https://installations.militaryonesource.mil/military-installation/fort-drum/education/education|title=Fort Drum Education|publisher=Militaryonesource|access-date=2024-12-21|quote=There are no school districts located on Fort Drum.}}
See also: {{cite web|url=https://www2.census.gov/geo/maps/dc10map/sch_dist/st36_ny/c36045_jefferson/DC10SD_C36045_001.pdf|title=SCHOOL DISTRICT REFERENCE MAP (2010 CENSUS): Jefferson County, NY|publisher=U.S. Census Bureau|access-date=2024-12-21|quote=UNI 99997 School District Not Defined}} - [https://www2.census.gov/geo/maps/dc10map/sch_dist/st36_ny/c36045_jefferson/DC10SD_C36045_SD2MS.txt Text list] - The 2020 map [https://www2.census.gov/geo/maps/DC2020/PL20/st36_ny/schooldistrict_maps/c36045_jefferson/DC20SD_C36045.pdf has no label for the area not in any school district] - [https://www2.census.gov/geo/maps/DC2020/PL20/st36_ny/schooldistrict_maps/c36045_jefferson/DC20SD_C36045_SD2MS.txt see 2020 text list] Fort Drum sends K-12 students in some portions to the Carthage school district, and others to the Indian River school district.{{cite web|url=https://installations.militaryonesource.mil/military-installation/fort-drum/education/education|title=Fort Drum Education|publisher=Militaryonesource|access-date=2024-12-21}}

† - County Seat

†† - Former Village

{{div col|colwidth=12em}}

• Adams
• Alexandria
• Antwerp
• Brownville
• Cape Vincent
• Champion
• Clayton
• Ellisburg
• Henderson
• Hounsfield
• Le Ray
• Lorraine
• Lyme
• Orleans
• Pamelia
• Philadelphia
• Rodman
• Rutland
• Theresa
• Watertown
• Wilna
• Worth

{{div col end}}

• Sanfords Four Corners

File:Old Jefferson County Courthouse, Arsenal & Sherman Streets, Watertown (Jefferson County, New York).jpg

Legislative authority is vested in the county Board of Legislators, which consists of 15 members each elected from single member districts for two-year terms.{{cite web|title=Jefferson County, New York : Legislature|url=http://co.jefferson.ny.us/index.aspx?page=52|website=co.jefferson.ny.us|access-date=April 5, 2016|archive-date=November 14, 2016|archive-url=https://web.archive.org/web/20161114235809/http://co.jefferson.ny.us/index.aspx?page=52|url-status=live}} As of 2018, there are 14 Republicans and 1 Democrat.

Jefferson County is reliably Republican. Since 1884, Democrats only carried the county twice, in 1964 and in 1996.

{{PresHead|place=Jefferson County, New York|source={{cite web|url=http://uselectionatlas.org/RESULTS|title=Dave Leip's Atlas of U.S. Presidential Elections|first=David|last=Leip|website=uselectionatlas.org|access-date=March 19, 2018|archive-date=March 23, 2018|archive-url=https://web.archive.org/web/20180323225526/https://uselectionatlas.org/RESULTS/|url-status=live}}}}

{{PresRow|2024|Republican|26,417|16,326|100|New York}}

{{PresRow|2020|Republican|25,629|17,307|919|New York}}

{{PresRow|2016|Republican|21,763|13,809|2,664|New York}}

{{PresRow|2012|Republican|18,122|17,099|487|New York}}

{{PresRow|2008|Republican|20,220|18,166|500|New York}}

{{PresRow|2004|Republican|21,231|16,860|709|New York}}

{{PresRow|2000|Republican|18,192|16,799|1,432|New York}}

{{PresRow|1996|Democratic|12,362|16,783|4,982|New York}}

{{PresRow|1992|Republican|14,227|13,380|9,819|New York}}

{{PresRow|1988|Republican|19,304|14,137|181|New York}}

{{PresRow|1984|Republican|23,445|10,960|91|New York}}

{{PresRow|1980|Republican|16,455|13,271|3,402|New York}}

{{PresRow|1976|Republican|20,401|13,503|124|New York}}

{{PresRow|1972|Republican|23,123|11,629|65|New York}}

{{PresRow|1968|Republican|18,552|13,438|1,119|New York}}

{{PresRow|1964|Democratic|10,718|25,175|21|New York}}

{{PresRow|1960|Republican|24,290|15,800|25|New York}}

{{PresRow|1956|Republican|28,429|9,959|0|New York}}

{{PresRow|1952|Republican|27,932|12,026|13|New York}}

{{PresRow|1948|Republican|19,661|13,176|514|New York}}

{{PresRow|1944|Republican|21,834|14,449|46|New York}}

{{PresRow|1940|Republican|25,584|14,581|97|New York}}

{{PresRow|1936|Republican|24,925|13,975|566|New York}}

{{PresRow|1932|Republican|22,760|13,478|486|New York}}

{{PresRow|1928|Republican|26,361|12,908|426|New York}}

{{PresRow|1924|Republican|21,159|7,665|2,118|New York}}

{{PresRow|1920|Republican|22,072|7,925|1,204|New York}}

{{PresRow|1916|Republican|11,197|7,089|795|New York}}

{{PresRow|1912|Republican|6,692|6,054|4,878|New York}}

{{PresRow|1908|Republican|11,477|6,694|1,642|New York}}

{{PresRow|1904|Republican|12,050|6,696|1,147|New York}}

{{PresRow|1900|Republican|11,870|6,776|805|New York}}

{{PresRow|1896|Republican|11,411|6,644|689|New York}}

{{PresRow|1892|Republican|9,856|7,181|1,109|New York}}

{{PresRow|1888|Republican|9,861|7,562|713|New York}}

{{PresRow|1884|Republican|9,029|7,075|669|New York}}

|}

{{As of|2021}} the sheriff is Colleen M. O'Neill. O'Neill is the first female sheriff elected in the state, and was first elected in 2014.{{Cite web|title=Sheriff's Office|url=https://co.jefferson.ny.us/departments/SheriffsOffice|access-date=November 2, 2021|website=Welcome to Jefferson County, New York|archive-date=November 2, 2021|archive-url=https://web.archive.org/web/20211102234726/https://co.jefferson.ny.us/departments/SheriffsOffice|url-status=live}}{{Cite web|title=Colleen O'Neill|url=https://nysheriffs.org/sheriff/colleen-oneill/|access-date=November 3, 2021|language=en|website=NY Sheriffs Association|archive-date=November 3, 2021|archive-url=https://web.archive.org/web/20211103001934/https://nysheriffs.org/sheriff/colleen-oneill/|url-status=live}}{{Cite web|last=KELLYbkelly@wdt.net|first=BRIAN|title=Jefferson County Sheriff Colleen M. O'Neill will not seek reelection|url=https://www.nny360.com/news/government/jefferson-county-sheriff-colleen-m-o-neill-will-not-seek-reelection/article_3f13e9e6-cab1-5062-8866-2cd6c7cac5d4.html|access-date=November 3, 2021|website=NNY360|date=October 15, 2021 |language=en|archive-date=November 3, 2021|archive-url=https://web.archive.org/web/20211103001934/https://www.nny360.com/news/government/jefferson-county-sheriff-colleen-m-o-neill-will-not-seek-reelection/article_3f13e9e6-cab1-5062-8866-2cd6c7cac5d4.html|url-status=live}}

In 2012, the Sheriff's Office was the subject of three unrelated sexual harassment lawsuits by a female deputy and two other women.{{Cite web|date=November 29, 2012|title=Three lawsuits target Jefferson County Sheriff's Department|url=https://www.wrvo.org/regional-coverage/2012-11-29/three-lawsuits-target-jefferson-county-sheriffs-department|access-date=November 2, 2021|website=WRVO Public Media|language=en|archive-date=November 2, 2021|archive-url=https://web.archive.org/web/20211102234727/https://www.wrvo.org/regional-coverage/2012-11-29/three-lawsuits-target-jefferson-county-sheriffs-department|url-status=live}}{{Cite web|date=May 3, 2012|title=Attorney for Sheriff's deputy describes alleged harassment on the job in $50 million suit|url=https://www.wrvo.org/regional-coverage/2012-05-02/attorney-for-sheriffs-deputy-describes-alleged-harassment-on-the-job-in-50-million-suit|access-date=November 2, 2021|website=WRVO Public Media|language=en|archive-date=November 2, 2021|archive-url=https://web.archive.org/web/20211102234727/https://www.wrvo.org/regional-coverage/2012-05-02/attorney-for-sheriffs-deputy-describes-alleged-harassment-on-the-job-in-50-million-suit|url-status=live}}{{Cite web|date=April 18, 2012|title=Sheriff's deputy files suit against Jefferson County department over topless photos|url=https://www.wrvo.org/regional-coverage/2012-04-17/sheriffs-deputy-files-suit-against-jefferson-county-department-over-topless-photos|access-date=November 2, 2021|website=WRVO Public Media|language=en|archive-date=November 2, 2021|archive-url=https://web.archive.org/web/20211102234728/https://www.wrvo.org/regional-coverage/2012-04-17/sheriffs-deputy-files-suit-against-jefferson-county-department-over-topless-photos|url-status=live}}

{{div col|colwidth=20em}}

• Antique Boat Museum
• Boldt Castle
• Burnham Point State Park
• Canoe-Picnic Point State Park
• Cape Vincent
• Carleton Island
• Cedar Point State Park
• Clayton
• Dewolf Point State Park
• Duffy Fairgrounds
• Fairview Manor
• Fort Drum
• Grass Point State Park
• Grenadier Island
• Grindstone Island Upper Schoolhouse
• Lake Ontario National Marine Sanctuary{{Cite web |title=Lake Ontario National Marine Sanctuary |url=https://sanctuaries.noaa.gov/lake-ontario/ |access-date=October 14, 2024 |website=sanctuaries.noaa.gov}}{{cite web |url=https://sanctuaries.noaa.gov/lake-ontario/celebrate.html |title=Lake Ontario National Marine Sanctuary Designation Ceremony |author= |date= |website=sanctuaries.noaa.gov |publisher=National Oceanic and Atmospheric Administration |access-date=October 14, 2024}}
• National Register of Historic Places listings in Jefferson County, New York
• Orleans
• Paddock Arcade
• Paddock Mansion
• Public Square Historic District
• Roswell P. Flower Memorial Library
• Sackets Harbor
• Sackets Harbor Battlefield State Historic Site
• Thousand Islands
• Thousand Islands National Park
• Tibbetts Point Lighthouse
• Union Hotel (Sackets Harbor, New York)
• Watertown
• Wellesley Island State Park
• Thousand Islands Arts Center

{{div col end}}

{{Portal|New York (state)}}

• List of counties in New York

{{reflist}}

• {{cite Q|Q114149636|p=525-28|chapter=Chapter IV. Jefferson County.

|editor=Sullivan, James

|editor2=Williams, Melvin E.

|editor3=Conklin, Edwin P.

|editor4=Fitzpatrick, Benedict

}}

{{Commons category|Jefferson County, New York}}

• [http://www.co.jefferson.ny.us Jefferson County webpage]
• [https://web.archive.org/web/20050602074228/http://www.rootsweb.com/~nyjeffer/ Guide to historical information]
• [https://web.archive.org/web/20060517021241/http://www.usgennet.org/usa/ny/state/his/bk4/ch4.html Summary history of Jefferson County, NY and its towns]
• [https://jeffcowiki.miraheze.org/wiki/Main_Page Jefferson County NY Wiki]

{{Geographic Location

| Centre = Jefferson County, New York

| North = United Counties of Leeds and Grenville, Ontario {{flagicon|Canada}}

| Northeast = St. Lawrence County

| East =

| Southeast = Lewis County

| South =

| Southwest = Oswego County

| West = Lake Ontario

| Northwest = Frontenac County, Ontario {{flagicon|Canada}}

}}

{{Jefferson County, New York}}

{{New York}}

{{coord|43.99|-76.05|display=title|type:adm2nd_region:US-NY_source:UScensus1990}}

{{authority control}}

Category:New York (state) counties

Category:1805 establishments in New York (state)

Category:Populated places established in 1805

Category:Thousand Islands