List of counties in California

{{Infobox subdivision type

| name = Counties of California

| alt_name =

| map = {{California County Labelled Map|width=280}}
280px

| category =

| territory = State of California

| start_date = 1850 (27 original counties)

| current_number = 58 counties

| number_date =

| population_range = Minimum: Alpine, 1,099
Maximum: Los Angeles, 9,757,179

| area_range = Minimum: San Francisco, {{Convert|47|sqmi}}
Maximum: San Bernardino, {{Convert|20062|sqmi}}

| government = Local government in California

| subdivision = Charter cities

}}

The U.S. state of California is divided into 58 counties.{{cite web|url=https://census.ca.gov/regions/|title=Regions | CA Census}} The state was first divided into 27 counties on February 18, 1850. These were further sub-divided to form sixteen additional counties by 1860. Another fourteen counties were formed through further subdivision from 1861 to 1893. The most recent county to form was Imperial County, in 1907. California is home to San Bernardino County, the largest county in the contiguous United States, as well as Los Angeles County, the most populous county in the United States.

The counties of California are local arms of the State of California, described by the Supreme Court of California as agents ("the county is merely a political subdivision of state government, exercising only the powers of the state, granted by the state…'") and the property they hold is held on behalf of all the people of the state.{{cite journal |last1=Eigerman |first1=Jared |date=1 Jan 1999 |title=California Counties: Second-Rate Localities or Ready-Made Regional Governments? |url=https://repository.uclawsf.edu/cgi/viewcontent.cgi?article=1678&context=hastings_constitutional_law_quaterly |format=PDF |journal=Hastings Constitutional Law Quarterly |volume=26 |issue=3 |pages=8 |access-date=16 Aug 2023 |url-status=live |archive-url=https://web.archive.org/web/20240709055533/https://repository.uclawsf.edu/cgi/viewcontent.cgi?article=1678&context=hastings_constitutional_law_quaterly |archive-date=July 9, 2024}}{{cite report | author=Supreme Court of California | author-link=Supreme Court of California | date=Feb 16, 1960 | title=County of Marin v. Superior Court | url=https://scocal.stanford.edu/opinion/county-marin-v-superior-court-29835 | access-date =16 Aug 2023 |volume=53 Cal.2d 633 |docket=22592 |url-status=live |archive-url=https://web.archive.org/web/20250318111554/https://scocal.stanford.edu/opinion/county-marin-v-superior-court-29835 |archive-date=Mar 18, 2025}} As such, the State Legislature may delegate any of the functions of the State to the counties but likewise can reassume any delegated duties.{{cite web |url=https://www.counties.org/sites/main/files/file-attachments/tab_1_-_intro_to_california_counties.pdf |title=An Introduction to California Counties |publisher=California State Association of Counties |access-date=July 22, 2022 |url-status=dead |archive-url=https://web.archive.org/web/20241026110507/https://www.counties.org/sites/main/files/file-attachments/tab_1_-_intro_to_california_counties.pdf |archive-date=October 26, 2024}}

California counties are general law counties by default. Still, they may be chartered as provided in Article XI, Section 3 of the California Constitution.{{cite web |url=https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CONS§ionNum=SEC.%203.&article=XI |title=California Constitution, Article XI Local Government [sec. 1 – Sec. 15] Sec. 3 |date=June 2, 1970 |website=California Legislative Information |publisher=State of California |access-date=May 10, 2018 }} A charter county is granted limited home rule powers. Of the 58 counties in California, 14 are governed under a charter. They are Alameda, Butte, El Dorado, Fresno, Los Angeles, Orange, Placer, Sacramento, San Bernardino, San Diego, San Francisco, San Mateo, Santa Clara, and Tehama.{{cite web |url=http://www.counties.org/general-information/county-structure-0 |title=County Structure & Powers |date=May 26, 2015 |publisher=California State Association of Counties |access-date=May 10, 2018 |url-status=dead |archive-url=https://web.archive.org/web/20250206193636/https://www.counties.org/general-information/county-structure-0 |archive-date=Feb 6, 2025}}

Nine counties in California are named for saints, tied with Louisiana for the largest number. This count omits Santa Cruz ("Holy Cross") County, not named for a saint; Merced County and Los Angeles County, both of whose names refer to Saint Mary (Our Lady of Mercy (Merced) and Our Lady Queen of The Angels (Los Angeles)); and Ventura County, whose name is a shortening of the name of St. Bonaventure, the namesake of the local mission.{{cite book|last1=Kane|first1=Joseph Nathan|last2=Aiken|first2=Charles Curry|title=The American Counties: Origins of County Names, Dates of Creation, and Population Data, 1950–2000|url=https://books.google.com/books?id=yC9vFvCuW84C&pg=PR11|year=2005|publisher=Scarecrow Press|isbn=978-0-8108-5036-1|page=11}}

List

{{Countytabletop

| region_width =

| fips_ref = {{cite web

| url = https://www.epa.gov/enviro/county-fips-code-listing-state-california

| title = EPA County FIPS Code Listing

| work = U.S. Environmental Protection Agency

| access-date = February 23, 2021}}

| region_seat_title = County seat

| region_seat_width = 100px

| region_seat_ref = {{cite web

|url = http://www.naco.org/Template.cfm?Section=Find_a_County&Template=/cffiles/counties/state.cfm&state.cfm&statecode=CA

|title = NACo – Find a county

|author = National Association of Counties

|access-date = April 30, 2008

|url-status = dead

|archive-url = https://web.archive.org/web/20080605065216/http://www.naco.org/Template.cfm?Section=Find_a_County&Template=%2Fcffiles%2Fcounties%2Fstate.cfm&state.cfm&statecode=CA

|archive-date = June 5, 2008

}}

| data2_title = {{abbr|Est.|Established}}

| data2_width =

| data2_ref =

| data3_title = Formed from

| data3_width =

| data3_ref =

| data4_title = Etymology

| data4_width = 350px

| data4_ref = {{cite book

| last = Sanchez | first = Nellie Van de Grift

| title = Spanish and Indian Place Names of California: Their Meaning and Their Romance

| location = San Francisco

| publisher = A. M. Robertson

| year = 1914

| isbn = 9781404750845

| url = https://books.google.com/books?id=gKgYAAAAIAAJ

| oclc = 4268886}}

| data4_unsortable = yes

| data5_title = General Law or Charter

| data5_width =

| data5_ref =

| population_year = 2024

| population_ref = {{cite web

| url = https://www.census.gov/

| title = US Census Bureau

| publisher = United States Census Bureau, Population Division

| date = March 2025

}}

| area_title = Area

| area_ref =

| density_title = Density

| density_ref =

}}

{{Countyrow |N=06 |Num=001 |Name=Alameda |Seat=Oakland |Data2=1853 |Data3=Contra Costa and Santa Clara |Data4=The oak and other trees, once abundant in the region; alameda is Spanish for "avenue shaded by trees" or "cottonwood grove". |Data5=Charter |Population=1649060 |Area=738 |Density=2234.5 |Size=100px}}

{{Countyrow |N=06 |Num=003 |Name=Alpine |Seat=Markleeville |Data2=1864 |Data3=Amador, El Dorado, Calaveras, Mono and Tuolumne |Data4=Location high in the Sierra Nevada; alpine refers to the Alps or other mountains. |Data5= General Law|Population=1099 |Area=739 |Density=1.5 |Size=100px}}

{{Countyrow |N=06 |Num=005 |Name=Amador |Seat=Jackson |Data2=1854 |Data3=Calaveras |Data4=Jose Maria Amador (1794–1883), a soldier, rancher, and miner who, along with several Native Americans, established a successful gold mining camp near present-day Amador City in 1848 |Data5=General Law|Population=42026 |Area=606 |Size=100px}}

{{Countyrow |N=06 |Num=007 |Name=Butte |Seat=Oroville |Data2=1850 |Data3=original|Data4=Sutter Buttes, which were mistakenly thought to be in the county at the time of its establishment |Data5=Charter|Population=208334 |Area=1640 |Size=100px}}

{{Countyrow |N=06 |Num=009 |Name=Calaveras |Seat=San Andreas |Data2=1850 |Data3=original|Data4=Calaveras River; calaveras is Spanish for "skulls". |Data5=General Law|Population=46505 |Area=1020 |Size=100px}}

{{Countyrow |N=06 |Num=011 |Name=Colusa |Seat=Colusa |Data2=1850 |Data3=original|Data4=Rancho Colus land grant from Mexico |Data5=General Law|Population=22074 |Area=1151 |Size=100px}}

{{Countyrow |N=06 |Num=013 |Name=Contra Costa |Seat=Martinez |Data2=1850 |Data3=original|Data4=Location across San Francisco Bay from San Francisco; contra costa is Spanish for "opposite coast". |Data5=General Law|Population=1172607 |Area=720 |Size=100px}}

{{Countyrow |N=06 |Num=015 |Name=Del Norte |Seat=Crescent City |Data2=1857 |Data3=Klamath |Data4=Location along California's northern border; del norte is Spanish for "northern". |Data5=General Law|Population=27009 |Area=1008 |Size=100px}}

{{Countyrow |N=06 |Num=017 |Name=El Dorado |Seat=Placerville |Data2=1850 |Data3=original|Data4=El Dorado, a mythical city of gold, owing to the area's significance in the California Gold Rush |Data5=Charter|Population=192823 |Area=1712 |Size=100px}}

{{Countyrow |N=06 |Num=019 |Name=Fresno |Seat=Fresno |Data2=1856 |Data3=Mariposa, Merced and Tulare |Data4=The city of Fresno; fresno is Spanish for "ash tree". |Data5=Charter|Population=1024125|Area=5963 |Size=100px}}

{{Countyrow |N=06 |Num=021 |Name=Glenn |Seat=Willows |Data2=1891 |Data3=Colusa |Data4=Hugh J. Glenn, a California businessman and politician |Data5=General Law|Population=28304 |Area=1315 |Size=100px}}

{{Countyrow |N=06 |Num=023 |Name=Humboldt |Seat=Eureka |Data2=1853 |Data3=Trinity |Data4=Alexander von Humboldt, a German naturalist and explorer |Data5=General Law|Population=132380 |Area=3573 |Size=100px}}

{{Countyrow |N=06 |Num=025 |Name=Imperial |Seat=El Centro |Data2=1907 |Data3=San Diego |Data4=Imperial Valley, named after the Imperial Land Company |Data5=General Law|Population=181724 |Area=4175 |Size=100px}}

{{Countyrow |N=06 |Num=027 |Name=Inyo |Seat=Independence |Data2=1866 |Data3=Mono and Tulare |Data4=Exact etymology disputed; early settlers believed Inyo to be the native name for area mountains, but it may be the name of a Mono Indian leader. |Data5=General Law|Population=18485 |Area=10192 |Size=100px}}

{{Countyrow |N=06 |Num=029 |Name=Kern |Seat=Bakersfield |Data2=1866 |Data3=Los Angeles and Tulare |Data4=Edward Kern, cartographer for John C. Fremont's 1845 expedition |Data5=General Law|Population=922529 |Area=8142 |Size=100px}}

{{Countyrow |N=06 |Num=031 |Name=Kings |Seat=Hanford |Data2=1893 |Data3=Tulare |Data4=Kings River; original Spanish name Rio de los Santos Reyes ("River of the Holy Kings") |Data5=General Law|Population=154913 |Area=1390 |Size=100px}}

{{Countyrow |N=06 |Num=033 |Name=Lake |Seat=Lakeport |Data2=1861 |Data3=Napa |Data4= Clear Lake |Data5=General Law|Population=67764 |Area=1258 |Size=100px}}

{{Countyrow |N=06 |Num=035 |Name=Lassen |Seat=Susanville |Data2=1864 |Data3=Plumas and Shasta, and now defunct Lake County, Nevada |Data4=Peter Lassen, a Danish naturalist and explorer |Data5=General Law|Population=28340 |Area=4558 |Size=100px}}

{{Countyrow |N=06 |Num=037 |Name=Los Angeles |Seat=Los Angeles |Data2=1850 |Data3=original|Data4=The city of Los Angeles, derived from the original Spanish name El Pueblo de Nuestra Señora la Reina de los Angeles del Río de Porciúncula ("The Village of Our Lady, the Queen of the Angels of the River of Porziuncola") |Data5=Charter|Population=9757179 |Area=4060 |Size=100px}}

{{Countyrow |N=06 |Num=039 |Name=Madera |Seat=Madera |Data2=1893 |Data3=Fresno |Data4=The city of Madera, which was named for the lumber industry it was created for; madera is Spanish for "wood" or "timber". |Data5=General Law|Population=165432 |Area=2138 |Size=100px}}

{{Countyrow |N=06 |Num=041 |Name=Marin |Seat=San Rafael |Data2=1850 |Data3=original|Data4=Chief Marin, "great chief of the tribe Licatiut" (a branch of the Coast Miwok people) |Data5=General Law|Population=256400 |Area=520 |Size=100px}}

{{Countyrow |N=06 |Num=043 |Name=Mariposa |Seat=Mariposa |Data2=1850 |Data3=original|Data4=The city of Mariposa; mariposa is Spanish for "butterfly". |Data5=General Law|Population=17048 |Area=1451 |Size=100px}}

{{Countyrow |N=06 |Num=045 |Name=Mendocino |Seat=Ukiah |Data2=1850 |Data3=original|Data4=Antonio de Mendoza, first viceroy of New Spain |Data5=General Law|Population=89175 |Area=3509 |Size=100px}}

{{Countyrow |N=06 |Num=047 |Name=Merced |Seat=Merced |Data2=1855 | Data3=Mariposa |Data4=The city of Merced, derived from the original Spanish name El Río de Nuestra Señora de la Merced ("River of Our Lady of Mercy") |Data5=General Law|Population=296774 |Area=1929 |Size=100px}}

{{Countyrow |N=06 |Num=049 |Name=Modoc |Seat=Alturas |Data2=1874 |Data3=Siskiyou |Data4=The Modoc people |Data5=General Law|Population=8491 |Area=3944 |Size=100px}}

{{Countyrow |N=06 |Num=051 |Name=Mono |Seat=Bridgeport |Data2=1861 |Data3=Calaveras, Fresno and Mariposa |Data4=Mono Lake; derived from Monachi, a Yokuts name for native peoples of the Sierra Nevada |Data5=General Law|Population=12991 |Area=3044 |Size=100px}}

{{Countyrow |N=06 |Num=053 |Name=Monterey |Seat=Salinas |Data2=1850 |Data3=original|Data4=Derived from Monterey Bay, which was named for a Viceroy of New Spain, Gaspar de Zúñiga, 5th Count of Monterrey |Data5=General Law|Population=436251 |Area=3322 |Size=100px}}

{{Countyrow |N=06 |Num=055 |Name=Napa |Seat=Napa |Data2=1850 |Data3=original|Data4=Disputed origin; possibly derived from the Patwin word napo, meaning "home" |Data5=General Law|Population=132727 |Area=754 |Size=100px}}

{{Countyrow |N=06 |Num=057 |Name=Nevada |Seat=Nevada City |Data2=1851 |Data3=Yuba |Data4=The phrase Sierra Nevada; nevada is Spanish for "snow-covered", referencing the area's high elevation. The bordering state was named after the county, which was named after Nevada City.{{Citation needed|date=February 2024}} |Data5=General Law|Population=102195 |Area=958 |Size=100px}}

{{Countyrow |N=06 |Num=059 |Name=Orange |Seat=Santa Ana |Data2=1889 |Data3=Los Angeles |Data4=Oranges, to illustrate a perception of a region with a semi-tropical atmosphere to those from the eastern parts of the United States|Data5=Charter|Population=3170435 |Area=948 |Size=100px}}

{{Countyrow |N=06 |Num=061 |Name=Placer |Seat=Auburn |Data2=1851 |Data3=Sacramento |Data4=Placer mining, a reference to the area being a center of the California Gold Rush |Data5=Charter|Population=433822 |Area=1407 |Size=100px}}

{{Countyrow |N=06 |Num=063 |Name=Plumas |Seat=Quincy |Data2=1854 |Data3=Butte |Data4=The Feather River; plumas is Spanish for "feathers". |Data5=General Law|Population=18834 |Area=2554 |Size=100px}}

{{Countyrow |N=06 |Num=065 |Name=Riverside |Seat=Riverside |Data2=1893 |Data3=San Bernardino and San Diego |Data4=The city of Riverside, named for its location on the Santa Ana River |Data5=General Law|Population=2529933 |Area=7208 |Size=100px}}

{{Countyrow |N=06 |Num=067 |Name=Sacramento |Seat=Sacramento |Data2=1850 |Data3=original|Data4=The city of Sacramento, named after the Santísimo Sacramento (Spanish for "Most Holy Sacrament") |Data5=Charter|Population=1611231 |Area=966 |Size=100px}}

{{Countyrow |N=06 |Num=069 |Name=San Benito |Seat=Hollister |Data2=1874 |Data3=Monterey |Data4=Saint Benedict (Benito is a Spanish diminutive of Benedict). |Data5=General Law|Population=69159 |Area=1389 |Size=100px}}

{{Countyrow |N=06 |Num=071 |Name=San Bernardino |Seat=San Bernardino |Data2=1853 |Data3=Los Angeles |Data4=The city of San Bernardino, named after Saint Bernardino of Siena (Spanish for Saint Bernardine) |Data5=Charter|Population=2214281 |Area=20062 |Size=100px}}

{{Countyrow |N=06 |Num=073 |Name=San Diego |Seat=San Diego |Data2=1850 |Data3=original|Data4=The city of San Diego, from Mission San Diego (Spanish for Saint Didacus) |Data5=Charter|Population=3298799 |Area=4204 |Size=100px}}

{{Countyrow |N=06 |Num=075 |Name=City and County of San Francisco |Notype=yes |Map=Map of California highlighting San Francisco County.svg |Seat=San Francisco |Data2=1850 |Data3=original|Data4=The city of San Francisco, from Presidio of San Francisco and Mission San Francisco de Asís, named after Saint Francis of Assisi (Spanish for Saint Francis) |Data5=Charter|Population=827526 |Area=47 |Size=100px}}

{{Countyrow |N=06 |Num=077 |Name=San Joaquin |Seat=Stockton |Data2=1850 |Data3=original|Data4=Spanish for Saint Joachim, father of the Virgin Mary |Data5=General Law|Population=816108 |Area=1399 |Size=100px}}

{{Countyrow |N=06 |Num=079 |Name=San Luis Obispo |Seat=San Luis Obispo |Data2=1850 |Data3=original|Data4=The city of San Luis Obispo, from Mission San Luis Obispo, named after Saint Louis of Toulouse (Spanish for Saint Louis, the Bishop) |Data5=General Law|Population=281843 |Area=3304 |Size=100px}}

{{Countyrow |N=06 |Num=081 |Name=San Mateo |Seat=Redwood City |Data2=1856 |Data3=San Francisco and Santa Cruz |Data4=Spanish for Saint Matthew |Data5=Charter|Population=742893 |Area=449 |Size=100px}}

{{Countyrow |N=06 |Num=083 |Name=Santa Barbara |Seat=Santa Barbara |Data2=1850 |Data3=original|Data4=The city of Santa Barbara, from Mission Santa Barbara, (Spanish for Saint Barbara) |Data5=General Law|Population=444500 |Area=2738 |Size=100px}}

{{Countyrow |N=06 |Num=085 |Name=Santa Clara |Seat=San Jose |Data2=1850 |Data3=original|Data4=City of Santa Clara, from Mission Santa Clara de Asís, named for Saint Clare of Assisi (Spanish for Saint Clare) |Data5=Charter|Population=1926325 |Area=1291 |Size=100px}}

{{Countyrow |N=06 |Num=087 |Name=Santa Cruz |Seat=Santa Cruz |Data2=1850 |Data3=original|Data4=The city of Santa Cruz, from Mission Santa Cruz (Spanish for "holy cross") |Data5=General Law|Population=262406 |Area=446 |Size=100px}}

{{Countyrow |N=06 |Num=089 |Name=Shasta |Seat=Redding |Data2=1850 |Data3=original|Data4=Mount Shasta; the indigenous Shasta people|Data5=General Law (becoming Charter as of 1 January 2025)|Population=181121 |Area=3786 |Size=100px}}

{{Countyrow |N=06 |Num=091 |Name=Sierra |Seat=Downieville |Data2=1852 |Data3=Yuba |Data4=Sierra is Spanish for "mountain range", a reference to the area's topography |Data5=General Law|Population=3113 |Area=953 |Size=100px}}

{{Countyrow |N=06 |Num=093 |Name=Siskiyou |Seat=Yreka |Data2=1852 |Data3=Shasta and Klamath |Data4=Siskiyou Mountains; exact etymology of Siskiyou is disputed. |Data5=General Law|Population=42498 |Area=6287 |Size=100px}}

{{Countyrow |N=06 |Num=095 |Name=Solano |Seat=Fairfield |Data2=1850 |Data3=original|Data4=Chief Solano of the Suisunes |Data5=General Law|Population=455101 |Area=828 |Size=100px}}

{{Countyrow |N=06 |Num=097 |Name=Sonoma |Seat=Santa Rosa |Data2=1850 |Data3=original|Data4=Exact etymology disputed; probably a Pomo term meaning "valley of the moon", which references a native legend about spiritual activity in the area |Data5=General Law|Population=485375 |Area=1576 |Size=100px}}

{{Countyrow |N=06 |Num=099 |Name=Stanislaus |Seat=Modesto |Data2=1854 |Data3=Tuolumne |Data4=Stanislaus River, named after Estanislao, a native of the area when California was under Spanish and Mexican rule |Data5=General Law|Population=556972 |Area=1495 |Size=100px}}

{{Countyrow |N=06 |Num=101 |Name=Sutter |Seat=Yuba City |Data2=1850 |Data3=original|Data4=John Sutter, a Swiss pioneer of California associated with the California Gold Rush |Data5=General Law|Population=98545 |Area=603 |Size=100px}}

{{Countyrow |N=06 |Num=103 |Name=Tehama |Seat=Red Bluff |Data2=1856 |Data3=Butte, Colusa and Shasta |Data4=The city of Tehama, probably a native term describing its location |Data5=Charter|Population=64451 |Area=2951 |Size=100px}}

{{Countyrow |N=06 |Num=105 |Name=Trinity |Seat=Weaverville |Data2=1850 |Data3=original|Data4=The city of Trinidad, Spanish for "trinity" |Data5=General Law|Population=15642 |Area=3179 |Size=100px}}

{{Countyrow |N=06 |Num=107 |Name=Tulare |Seat=Visalia |Data2=1852 |Data3=Mariposa |Data4=Tulare Lake, which is named after the tule rush (Schoenoplectus acutus) that grew in the marshes and sloughs along its shores |Data5=General Law|Population=483546 |Area=4824 |Size=100px}}

{{Countyrow |N=06 |Num=109 |Name=Tuolumne |Seat=Sonora |Data2=1850 |Data3=original|Data4=Exact etymology disputed; probably a corruption of the native term talmalamne, which means "cluster of stone wigwams", a reference to local cave dwelling tribes|Data5=General Law|Population=53893 |Area=2236 |Size=100px}}

{{Countyrow |N=06 |Num=111 |Name=Ventura |Seat=Ventura |Data2=1872 |Data3=Santa Barbara |Data4=The city of Ventura, derived from Mission San Buenaventura (Spanish for St. Bonaventure) |Data5=General Law|Population=835427 |Area=1846 |Size=100px}}

{{Countyrow |N=06 |Num=113 |Name=Yolo |Seat=Woodland |Data2=1850 |Data3=original|Data4=The Yolan people, a local Native American tribe |Data5=General Law|Population=225251 |Area=1012 |Size=100px}}

{{Countyrow |N=06 |Num=115 |Name=Yuba |Seat=Marysville |Data2=1850 |Data3=original|Data4=Named either by the Maidu people, a local Native American tribe who live on the banks of the Feather and Yuba Rivers, for one of their villages, or by Gabriel Moraga for the wild grapes (Vitis californica) that grow abundantly at the edge of the rivers (uva being Spanish for "grape") |Data5=General Law|Population=87469 |Area=630 |Size=100px}}

Defunct counties

Branciforte County was the original name of Santa Cruz County in 1850. The reference was to the 1797 town of Branciforte.
Klamath County was created in 1851 from the northern half of Trinity County. Part of the county's territory went to Del Norte County in 1857, and in 1874 the remainder was divided between Humboldt and Siskiyou counties.
Pautah County, California was created in 1852 out of territory which, the state of California assumed, was to be ceded to it by the United States Congress from territory in what is now the state of Nevada. When the cession never occurred, the California State Legislature officially abolished the never-organized county in 1859.
Buena Vista County was created in 1855 by the California State Legislature out of the southeastern territory of Tulare County on the west of the Sierra Nevada but was never officially organized. The south of Tulare County was later organized as Kern County in 1866, with additions from Los Angeles and San Bernardino counties.
Coso County was created in 1864 by the California State Legislature out of territory of Mono County and Tulare County on the east slope of the Sierra Nevada but was never officially organized. The region was later organized in 1866 as Inyo County with additions from Los Angeles and San Bernardino counties.
Roop County, Nevada encompassed much of Lassen County, including the Honey Lake Valley and the community of Susanville, California; ambiguous organic legislation of Nevada Territory led to confusion about the geographic extent of Nevada's western border. This was later clarified, with the portions of Roop County in California being assigned to Lassen County; the remaining, sparsely portions of Roop County were eventually combined with Washoe County, Nevada.

Proposed counties

Mojave County, proposed in 1988 that would have split the northern and eastern 90% of San Bernardino County
Cahuilla County, proposed in the 1980s by the residents of eastern Riverside County
Corona County, proposed in 2002 by residents of Corona and surrounding communities in Riverside County
High Desert County, proposed in the 1970s, 80s, and 90s to split from portions of Los Angeles, Kern and San Bernardino counties
Los Padres County, proposed in 1978 to split the northern portion of Santa Barbara County
Mission County, proposed in 2006 to split the northern portion of Santa Barbara County
Sequoia County, proposed in the 1990s, split from parts of southern Humboldt and Northern Mendocino counties

References

External links

[https://web.archive.org/web/20100107152529/http://csac.counties.org/ California State Association of Counties]
[https://web.archive.org/web/20110104034024/http://quickfacts.census.gov/qfd/maps/california_map.html State map showing the county names and linking to county data]
[http://www.counties.org/general-information/creation-our-58-counties California State Association of Counties- The Creation of Our 58 Counties, with Maps of the 58 Counties Each Decade ca.1850–1900]
[http://www.counties.org/general-information/california-county-map California State Association of Counties, Map of California Counties: c. 1907–Present]

Counties

California, counties in