The U.S. state of California is divided into 58 counties. Counties are responsible for all elections, property-tax collection, maintenance of public records such as deeds, and local-level courts within their borders, as well as providing law enforcement (through the county sheriff and sheriff's deputies) to areas that do not lie within incorporated cities.
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On January 4, 1850, the California constitutional committee recommended the formation of 18 counties. They were Benicia, Butte, Fremont, Los Angeles, Mariposa, Monterey, Mount Diablo, Oro, Redding, Sacramento, San Diego, San Francisco, San Joaquin, San Jose, San Luis Obispo, Santa Barbara, Sonoma, and Sutter. On April 22, the counties of Branciforte, Calaveras, Coloma, Colusi, Marin, Mendocino, Napa, Trinity, and Yuba were added. Benicia was renamed Solano, Coloma to El Dorado, Fremont to Yolo, Mt. Diablo to Contra Costa, San Jose to Santa Clara, Oro to Tuolumne, and Redding to Shasta. One of the first state legislative acts regarding counties was to rename Branciforte County to Santa Cruz, Colusi to Colusa, and Yola to Yolo.
The last California county to have been established is Imperial County in 1907.
The current number of counties was achieved over time by subdivision of many of the larger counties into smaller ones. The links in the column FIPS County Code are to the Census Bureau Info page for that county. The map at the right hand side also shows the FIPS codes for all the counties (on one map for easy reference).
Population Note: County and city populations are counted by two agencies, one the California Department of Finance (CDF) January 2008 data , and also US Census Bureau July 2008 data, using different counting methodology. California claims US Census consistently underreports due to difficulty in tracking immigrants, population data is used to calculate distribution of money for federal programs.
California's postal abbreviation is CA and its FIPS state code is 06.
County |
FIPS code [2] |
County seat [3] |
Established [3] |
Created from parts of |
Etymology [4] |
Population (CDF 1-08) [5] |
Population |
Area [3] |
Map |
---|---|---|---|---|---|---|---|---|---|
Alameda County | 001 | Oakland | 1853 | Contra Costa and Santa Clara | Alameda is Spanish for an avenue shaded by trees or a cottonwood grove | 1,543,000 | 1,474,368 | mi² (1,911 km²) |
738 ![]() |
Alpine County | 003 | Markleeville | 1864 | Amador, El Dorado, Calaveras, Mono and Tuolumne | Named for its location high in the Sierra Nevada mountains | 1,222 | 1,061 | ( 1,914 km2) |
739 sq mi![]() |
Amador County | 005 | Jackson | 1854 | Calaveras | Jose Maria Amador (1794-1883), a soldier, rancher and miner. In 1848, Amador, with several Native Americans, established a successful gold mining camp near the present town of Amador City. In Spanish, the word amador means "one who loves." | 37,943 | 38,238 | ( 1,536 km2) |
593 sq mi![]() |
Butte County | 007 | Oroville | 1850 | Original | From the Sutter Buttes, which were erroneously believed to lie within the county's borders at the time of its creation. | 220,407 | 220,337 | ( 4,248 km2) |
1,640 sq mi![]() |
Calaveras County | 009 | San Andreas | 1850 | Original | From the Calaveras River which in turn is named for the spanish word for skulls | 46,127 | 46,843 | ( 2,642 km2) |
1,020 sq mi![]() |
Colusa County | 011 | Colusa | 1850 | Original | From two Mexican land grants; Coluses (1844) and Colus (1845) | 21,910 | 21,204 | ( 2,981 km2) |
1,151 sq mi![]() |
Contra Costa County | 013 | Martinez | 1850 | Original | Spanish for opposite coast, because Contra Costa County is across San Francisco Bay from San Francisco | 1,051,674 | 1,029,703 | ( 1,865 km2) |
720 sq mi![]() |
Del Norte County | 015 | Crescent City | 1857 | Klamath | Spanish for Northern, because Del Norte County is the northwesternmost county in the state. | 29,419 | 29,100 | ( 2,611 km2) |
1,008 sq mi![]() |
El Dorado County | 017 | Placerville | 1850 | Original | From the mythical El Dorado, The Gilded One, in relation to El Dorado County's importance in the California Gold Rush. | 179,722 | 176,075 | ( 4,434 km2) |
1,712 sq mi![]() |
Fresno County | 019 | Fresno | 1856 | Mariposa, Merced and Tulare | From Fresno Creek. In Spanish, Fresno means "ash tree" | 931,098 | 909,153 | ( 15,444 km2) |
5,963 sq mi![]() |
Glenn County | 021 | Willows | 1891 | Colusa | Named for Dr. Hugh J. Glenn (1824-1883), a California businessman and politician. | 29,195 | 28,237 | ( 3,406 km2) |
1,315 sq mi![]() |
Humboldt County | 023 | Eureka | 1853 | Trinity | From Humboldt Bay, named after Alexander von Humboldt (1769-1859), a German naturalist and explorer. | 132,821 | 129,000 | ( 9,254 km2) |
3,573 sq mi![]() |
Imperial County | 025 | El Centro | 1907 | San Diego [6] | From the Imperial Valley, which took its name from the Imperial Land Company. | 176,158 | 163,972 | ( 10,813 km2) |
4,175 sq mi![]() |
Inyo County | 027 | Independence | 1866 | Mono and Tulare | From a Native American word for dwelling place of the great spirit. | 18,152 | 17,136 | ( 26,397 km2) |
10,192 sq mi![]() |
Kern County | 029 | Bakersfield | 1866 | Los Angeles and Tulare | From the Kern River, named for Edward Kern (1822 - 1863), cartographer for General John C. Fremont's 1845 expedition. | 817,517 | 800,458 | ( 21,088 km2) |
8,142 sq mi![]() |
Kings County | 031 | Hanford | 1893 | Tulare | Kings River – Rio de los Santos Reyes (River of the Holy Kings) to honor the Biblical Magi | 154,434 | 149,518 | ( 3,600 km2) |
1,390 sq mi![]() |
Lake County | 033 | Lakeport | 1861 | Napa | From Clear Lake | 64,059 | 64,866 | ( 3,258 km2) |
1,258 sq mi![]() |
Lassen County | 035 | Susanville | 1864 | Plumas and Shasta, and now defunct Lake County, Nevada. | Peter Lassen (1800-1859), a Danish naturalist and explorer. | 35,757 | 34,574 | ( 11,805 km2) |
4,558 sq mi![]() |
Los Angeles County | 037 | Los Angeles | 1850 | Original | Spanish for the Angels, abbreviated from El Pueblo de Nuestra Señora la Reina de los Angeles del RÃo de Porciúncula (The Village of Our Lady, the Queen of the Angels of the river of Porziuncola). | 10,363,850 | 9,862,049 | ( 10,515 km2) |
4,060 sq mi![]() |
Madera County | 039 | Madera | 1893 | Fresno | Spanish for wood. | 150,887 | 148,333 | ( 5,537 km2) |
2,138 sq mi![]() |
Marin County | 041 | San Rafael | 1850 | Original | Disputed but may have been a corrupted term for Marina for its location on the San Francisco Bay. | 257,406 | 248,794 | ( 1,347 km2) |
520 sq mi![]() |
Mariposa County | 043 | Mariposa | 1850 | Original[7] | Spanish and Portuguese for butterfly. | 18,406 | 17,976 | ( 3,758 km2) |
1,451 sq mi![]() |
Mendocino County | 045 | Ukiah | 1850 | Original | Antonio de Mendoza (c. 1495 - 1552), viceroy of Spain. | 90,163 | 86,221 | ( 9,088 km2) |
3,509 sq mi![]() |
Merced County | 047 | Merced | 1855 | Mariposa | From the Merced River, or in Spanish El RÃo de Nuestra Señora de la Merced (River of Our Lady of Mercy); named in 1806 by an expedition headed by Gabriel Moraga. | 255,250 | 246,117 | ( 4,996 km2) |
1,929 sq mi![]() |
Modoc County | 049 | Alturas | 1874 | Siskiyou | From the Native American Modoc people. | 9,702 | 9,184 | ( 10,215 km2) |
3,944 sq mi![]() |
Mono County | 051 | Bridgeport | 1861 | Calaveras, Fresno and Mariposa | For a local Native American tribe, the Mono Paiute people. | 13,759 | 12,774 | ( 7,884 km2) |
3,044 sq mi![]() |
Monterey County | 053 | Salinas | 1850 | Original | From Monterey Bay. The name itself is composed of the Spanish words monte (hill) and rey (king). | 428,549 | 408,238 | ( 8,604 km2) |
3,322 sq mi![]() |
Napa County | 055 | Napa | 1850 | Original | For a local Native American tribe, the Napans. | 136,704 | 133,433 | ( 1,953 km2) |
754 sq mi![]() |
Nevada County | 057 | Nevada City | 1851 | Yuba | snowfall in Spanish. | 99,186 | 97,118 | ( 2,481 km2) |
958 sq mi![]() |
Orange County | 059 | Santa Ana | 1889 | Los Angeles | From the citrus fruit widely grown in the region at the time the county was formed. | 3,121,251 | 3,010,759 | ( 2,046 km2) |
790 sq mi![]() |
Placer County | 061 | Auburn | 1851 | Sutter and Yuba | Named for the small flakes of gold found in the area during Gold Rush. | 333,401 | 341,945 | ( 3,893 km2) |
1,503 sq mi![]() |
Plumas County | 063 | Quincy | 1854 | Butte | For the Feather River, "Plumas" meaning "feathers" in Spanish. | 20,917 | 20,275 | ( 6,615 km2) |
2,554 sq mi![]() |
Riverside County | 065 | Riverside | 1893 | San Bernardino and San Diego | From the city of Riverside being alongside the Santa Ana River and the boundary extends to the Colorado River. | 2,088,322 | 2,100,516 | ( 18,669 km2) |
7,208 sq mi![]() |
Sacramento County | 067 | Sacramento | 1850 | Original | From the Sacramento River, itself named for the Santisimo Sacramento (Spanish for Most Holy Sacrament) a reference to the Eucharist. | 1,424,415 | 1,394,154 | ( 2,502 km2) |
966 sq mi![]() |
San Benito County | 069 | Hollister | 1874 | Monterey | in honor of San Benedicto (Saint Benedict), Benito is the diminutive of Benedicto. | 57,784 | 54,699 | ( 3,597 km2) |
1,389 sq mi![]() |
San Bernardino County | 071 | San Bernardino | 1853 | Los Angeles | Named for Saint Bernardino of Siena. The largest county in the continental U.S. | 2,055,766 | 2,015,355 | ( 51,960 km2) |
20,062 sq mi![]() |
San Diego County | 073 | San Diego | 1850 | Original | Named for San Diego Bay, itself named for Saint Didacus of Alcalá, or San Diego de Alcalá in Spanish. | 3,146,274 | 3,001,072 | ( 10,888 km2) |
4,204 sq mi![]() |
San Francisco County | 075 | San Francisco | 1850 | Original | Francis of Assisi (1181-1226), a Roman Catholic saint and founder of the Order of Friars Minor (Franciscans). | 845,559 | 845,559 | ( 122 km2) |
47 sq mi![]() |
San Joaquin County | 077 | Stockton | 1850 | Original | Spanish for Saint Joachim. | 685,660 | 672,388 | ( 3,623 km2) |
1,399 sq mi![]() |
San Luis Obispo County | 079 | San Luis Obispo | 1850 | Original | Spanish for St. Louis, the Bishop. | 269,337 | 265,297 | ( 8,557 km2) |
3,304 sq mi![]() |
San Mateo County | 081 | Redwood City | 1856 | San Francisco | Spanish for Saint Matthew | 739,469 | 712,690 | ( 1,163 km2) |
449 sq mi![]() |
Santa Barbara County | 083 | Santa Barbara | 1850 | Original | Spanish for Saint Barbara. | 428,655 | 405,396 | ( 7,091 km2) |
2,738 sq mi![]() |
Santa Clara County | 085 | San Jose | 1850 | Original | Spanish for Saint Clare, for the Santa Clara Valley and the Mission town of Santa Clara. | 1,837,075 | 1,764,499 | ( 3,344 km2) |
1,291 sq mi![]() |
Santa Cruz County | 087 | Santa Cruz | 1850 | Original | Originally called Branciforte County, was named after the city of Santa Cruz, which, in turn, took its name from La Misión de la Exaltación de la Santa Cruz (Mission of the Exaltation of the Holy Cross), which was established on the site of the town in 1791. | 266,519 | 253,137 | ( 1,155 km2) |
446 sq mi![]() |
Shasta County | 089 | Redding | 1850 | Original | After Mount Shasta despite the fact the volcanic peak isn't located in the county per se. | 182,236 | 180,214 | ( 9,806 km2) |
3,786 sq mi![]() |
Sierra County | 091 | Downieville | 1852 | Yuba | Mountain range in Spanish. | 3,380 | 3,263 | ( 2,468 km2) |
953 sq mi![]() |
Siskiyou County | 093 | Yreka | 1852 | Shasta and Klamath | County named after Siskiyou Mountain Range; etymology of Siskiyou is disputed | 45,971 | 44,542 | ( 16,283 km2) |
6,287 sq mi![]() |
Solano County | 095 | Fairfield | 1850 | Original | From an Indian Chief, Chief Solano of the Suisunes, a Native American tribe of the region. | 426,757 | 407,515 | ( 2,145 km2) |
828 sq mi![]() |
Sonoma County | 097 | Santa Rosa | 1850 | Original | After the village of Sonoma. | 484,470 | 466,741 | ( 4,082 km2) |
1,576 sq mi![]() |
Stanislaus County | 099 | Modesto | 1854 | Tuolumne | For the Stanislaus River, which was named for a Yokut Indian named Estanislao | 525,903 | 510,694 | ( 3,872 km2) |
1,495 sq mi![]() |
Sutter County | 101 | Yuba City | 1850 | Original | Named for Johann Augustus Sutter (a.k.a. John Sutter) (1803–1880), a Swiss pioneer of California known for his association with the California Gold Rush. His ranch land was originally named Nueva Helvetia after his homeland of Switzerland in Latinized-Spanish. | 95,878 | 92,207 | ( 1,562 km2) |
603 sq mi![]() |
Tehama County | 103 | Red Bluff | 1856 | Butte, Colusa and Shasta | For a local Native American tribe, the Tehama. | 62,419 | 61,550 | ( 7,643 km2) |
2,951 sq mi![]() |
Trinity County | 105 | Weaverville | 1850 | Original | From the Trinity River which in turn was named after the coastal town of Trinidad, California | 13,966 | 14,317 | ( 8,234 km2) |
3,179 sq mi![]() |
Tulare County | 107 | Visalia | 1852 | Mariposa | For a dry lake, Tulare Lake on the western end of the | 435,254 | 426,276 | ( 12,494 km2) |
4,824 sq mi![]() |
Tuolumne County | 109 | Sonora | 1850 | Original | The name for the Tuolumne River (twah'-luh-me) has as many possible meanings as it does spellings. The original meaning of the word "Tuolumne" may have been "cave people" or "stone wigwams," both taken from the history of tribes known as "Taulamnell," or "Tahualamne," or Yokuts Indians living near Knights Ferry in the rocks and recesses by the river. Another theory is that "Tuolumne" is derived from a Central Sierra Miwok word "talmalmne" whose meaning is unclear today. | 56,799 | 55,644 | ( 5,791 km2) |
2,236 sq mi![]() |
Ventura County | 111 | Ventura | 1872 | Santa Barbara | Abbreviation of San Buenaventura, Spanish for St. Bonaventure. | 831,587 | 797,740 | ( 4,781 km2) |
1,846 sq mi![]() |
Yolo County | 113 | Woodland | 1850 | Original | For a local Native American tribe, the Yolans. | 199,066 | 197,658 | ( 2,621 km2) |
1,012 sq mi![]() |
Yuba County | 115 | Marysville | 1850 | Original | For the Yuba family, who owned ranchos in the Sacramento River Valley. | 71,929 | 73,067 | ( 1,632 km2) |
630 sq mi![]() |
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