All 58 counties and their seats
An alphabetical list of every county in California, its county seat, and the region of this atlas where you will find it drawn and described.
The seven region maps
The seven regions are this site's own filing scheme, drawn roughly along county lines so that every county falls in exactly one. They are not an official division of California, and other publications group the counties differently.
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1. Far North
11 counties: Del Norte, Siskiyou, Modoc, Humboldt, Trinity, Shasta, Lassen, Tehama, Plumas, Mendocino, Lake.
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2. Sacramento Valley and Gold Country
14 counties: Glenn, Butte, Colusa, Sutter, Yuba, Sierra, Nevada, Placer, Yolo, Sacramento, El Dorado, Amador, Calaveras, Tuolumne.
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3. Bay Area
9 counties: Sonoma, Napa, Solano, Marin, Contra Costa, San Francisco, Alameda, San Mateo, Santa Clara.
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4. High Sierra and the East
4 counties: Alpine, Mono, Mariposa, Inyo.
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5. San Joaquin Valley
8 counties: San Joaquin, Stanislaus, Merced, Madera, Fresno, Kings, Tulare, Kern.
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6. Central Coast
6 counties: Santa Cruz, San Benito, Monterey, San Luis Obispo, Santa Barbara, Ventura.
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7. Southern California
6 counties: Los Angeles, Orange, San Bernardino, Riverside, San Diego, Imperial.
Counties A to Z
The county seat is the city or town where a county's government is based. For Ventura County the state lists the seat under the city's formal name, San Buenaventura; the city is widely known as Ventura.