| Area (in Square Miles) |
County | County Seat | Water | Land | Total | 1990 Pop. | Date Est. |
Alameda | Oakland | 83.8 | 737.5 | 821.3 | 1,279,182 | 1850 |
Alpine | Markleeville | 4.6 | 738.5 | 743.2 | 1113 | 1864 |
Amador | Jackson | 11.7 | 592.6 | 604.3 | 30,039 | 1854 |
Butte | Oroville | 37.6 | 1639.6 | 1677.2 | 182,120 | 1854 |
Calaveras | San Andreas | 16.7 | 1020.2 | 1036.9 | 31,998 | 1850 |
Colusa | Colusa | 5.5 | 1150.8 | 1156.3 | 16,275 | 1850 |
Contra Costa | Martinez | 81.9 | 720.3 | 802.2 | 803,732 | 1850 |
Del Norte | Crescent City | 222.0 | 1007.8 | 1229.8 | 23,460 | 1857 |
El Dorado | Placerville | 79.8 | 1711.5 | 1791.3 | 125,995 | 1850 |
Fresno | Fresno | 54.7 | 5963.2 | 6017.9 | 667,490 | 1856 |
Glenn | Willows | 12.4 | 1314.8 | 1327.2 | 24,798 | 1891 |
Humboldt | Eureka | 497.7 | 3554.8 | 4042.4 | 119,118 | 1853 |
Imperial | El Centro | 307 | 4175.1 | 4482.1 | 109,303 | 1907 |
Inyo | Independence | 35.7 | 10,192 | 10,227.7 | 18,281 | 1866 |
Kern | Bakersfield | 20.4 | 8141.6 | 8162 | 543,477 | 1866 |
Kings | Hanford | 2.1 | 1389.5 | 1391.6 | 101,469 | 1893 |
Lake | Lakeport | 71.1 | 1258.5 | 1329.6 | 50,631 | 1861 |
Lassen | Susanville | 163.1 | 4557.5 | 4720.6 | 27,598 | 1864 |
Los Angeles | Los Angeles | 692.3 | 4060 | 4752.3 | 8,863,164 | 1850 |
Madera | Madera | 15.0 | 2138.4 | 2153.4 | 88,090 | 1893 |
Marin | San Rafael | 308.4 | 519.8 | 828.2 | 230,096 | 1850 |
Mariposa | Mariposa | 11.7 | 1451.2 | 1462.9 | 14,302 | 1850 |
Mendocino | Ukiah | 369.2 | 3509.3 | 3878.5 | 80,345 | 1850 |
Merced | Merced | 43.1 | 1928.9 | 1972.0 | 178,403 | 1855 |
Modoc | Alturas | 259.3 | 3944.3 | 4203.6 | 9,678 | 1874 |
Mono | Bridgeport | 259.3 | 3944 | 4203.6 | 9,956 | 1861 |
Monterey | Salinas | 449.2 | 3321.9 | 3771.1 | 355,660 | 1850 |
Napa | Napa | 34.5 | 753.8 | 788.3 | 110,765 | 1850 |
Nevada | Nevada County | 16.9 | 957.6 | 974.5 | 78,510 | 1851 |
Orange | Santa Ana | 158.2 | 789.7 | 947.9 | 2,410,556 | 1889 |
Placer | Auburn | 95.8 | 1404.4 | 1500.2 | 172,796 | 1851 |
Plumas | Quincy | 59.8 | 2553.9 | 2613.7 | 19,739 | 1854 |
Riverside | Riverside | 95.7 | 7208.1 | 7303.8 | 1,170,413 | 1893 |
Sacramento | Sacramento | 30.0 | 965.7 | 995.7 | 1,041,219 | 1850 |
San Benito | Hollister | 1.7 | 1388.3 | 1390.0 | 36,697 | 1874 |
San Bernardino | San Bernardino | 44.6 | 20,061.8 | 20,106.4 | 1,418,380 | 1853 |
San Diego | San Diego | 321.4 | 4204.5 | 4525.9 | 2,498,016 | 1850 |
San Francisco | San Francisco | 185.2 | 146.7 | 231.9 | 723,959 | 1850 |
San Joaquin | Stockton | 26.9 | 1399.5 | 1426.4 | 480,628 | 1850 |
San Luis Obispo | San Luis Obispo | 311.2 | 3304.5 | 3615.7 | 217,162 | 1850 |
San Mateo | Redwood City | 292.0 | 449.1 | 741.1 | 649,643 | 1856 |
Santa Barbara | Santa Barbara | 1051.1 | 2738.5 | 3789.6 | 369,608 | 1850 |
Santa Clara | San Jose | 13.3 | 1291.2 | 1304.5 | 1,497,577 | 1850 |
Santa Cruz | Santa Cruz | 161.9 | 445.8 | 607.7 | 229,734 | 1850 |
Shasta | Redding | 62.0 | 3425.6 | 3487.6 | 147,036 | 1850 |
Sierra | Downieville | 8.6 | 953.4 | 962.0 | 3,318 | 1852 |
Siskiyou | Yreka | 60.6 | 1707.7 | 1768.3 | 43,531 | 1852 |
Solano | Fairfield | 78.7 | 828.2 | 906.9 | 340,421 | 1850 |
Sonoma | Santa Rosa | 192.1 | 1576.2 | 1768.3 | 388,222 | 1850 |
Stanislaus | Modesto | 20.2 | 1494.6 | 1514.8 | 370,522 | 1854 |
Sutter | Yuba City | 6.2 | 602.7 | 608.9 | 64,415 | 1850 |
Tehama | Red Bluff | 11.3 | 2951 | 2962.3 | 149,625 | 1856 |
Trinity | Weaverville | 28.9 | 3178.9 | 3207.8 | 13,063 | 1850 |
Tulare | Visalia | 15.1 | 4824.3 | 4839.4 | 311,921 | 1852 |
Tuolumne | Sonora | 38.9 | 2235.6 | 2274.5 | 48,456 | 1850 |
Ventura | Ventura | 362.4 | 1846 | 2208.4 | 669,016 | 1872 |
Yolo | Woodland | 10.4 | 1012.5 | 1022.9 | 141,092 | 1850 |
Yuba | Marysville | 13.1 | 630.5 | 643.6 | 58,228 | 1850 |
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