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California State Association of Counties
1100 K St Ste 101
Sacramento, CA 95814-3932
Phone: (916)327-7500
http://www.csac.counties.org

County NACo
Member
2010
Population
Square
Miles
County Seat Board
Size
Founded
Alameda 1,510,271 739 Oakland   1853 
Alpine 1,175 738 Markleeville   1864 
Amador 38,091 595 Jackson   1854 
Butte 220,000 1,636 Oroville   1850 
Calaveras 45,578 1,020 San Andreas   1850 
Colusa 21,419 1,151 Colusa   1850 
Contra Costa 1,049,025 716 Martinez   1850 
Del Norte 28,610 1,006 Crescent City   1857 
El Dorado 181,058 1,708 Placerville   1850 
Fresno   930,450 5,958 Fresno   1856 
Glenn 28,122 1,314 Willows   1891 
Humboldt 134,623 3,568 Eureka   1853 
Imperial 174,528 4,177 El Centro   1907 
Inyo 18,546 10,181 Independence   1866 
Kern 839,631 8,132 Bakersfield   1866 
Kings 152,982 1,389 Hanford   1893 
Lake 64,665 1,256 Lakeport   1861 
Lassen 34,895 4,541 Susanville   1864 
Los Angeles 9,818,605 4,058 Los Angeles   1850 
Madera 150,865 2,137 Madera   1893 
Marin 252,409 520 San Rafael   1850 
Mariposa 18,251 1,449 Mariposa   1850 
Mendocino 87,841 3,506 Ukiah   1850 
Merced 255,793 1,935 Merced   1855 
Modoc   9,686 3,918 Alturas   1874 
Mono 14,202 3,049 Bridgeport  1861 
Monterey 415,057 3,281 Salinas   1850 
Napa 136,484 748 Napa   1850 
Nevada 98,764 958 Nevada City   1851 
Orange 3,010,232 791 Santa Ana   1889 
Placer 348,432 1,407 Auburn   1851 
Plumas 20,007 2,553 Quincy   1854 
Riverside 2,189,641 7,206 Riverside   1893 
Sacramento 1,418,788 965 Sacramento  1850 
San Benito   55,269 1,389 Hollister   1874 
San Bernardino 2,035,210 20,057 San Bernardino   1853 
San Diego 3,095,313 4,207 San Diego  1850 
San Francisco* 805,235 47 San Francisco  11  1850 
San Joaquin 685,306 1,391 Stockton   1850 
San Luis Obispo 269,637 3,299 San Luis Obispo   1850 
San Mateo 718,451 448 Redwood City   1856 
Santa Barbara 423,895 2,735 Santa Barbara   1850 
Santa Clara 1,781,642 1,290 San Jose  1850 
Santa Cruz 262,382 445 Santa Cruz   1850 
Shasta 177,223 3,775 Redding   1850 
Sierra 3,240 953 Downieville   1852 
Siskiyou 44,900 6,278 Yreka   1852 
Solano 413,344 822 Fairfield   1850 
Sonoma 483,878 1,576 Santa Rosa  1850 
Stanislaus 514,453 1,495 Modesto   1854 
Sutter 94,737 602 Yuba City  1850 
Tehama 63,463 2,950 Red Bluff   1856 
Trinity 13,786 3,179 Weaverville   1850 
Tulare   442,179 4,824 Visalia   1852 
Tuolumne 55,365 2,221 Sonora   1850 
Ventura 823,318 1,843 Ventura  1872 
Yolo 200,849 1,015 Woodland   1850 
Yuba   72,155 632 Marysville   1850 

  * Consolidated City-County Government