Map of California Counties

California is divided into 58 counties that range from tiny San Francisco to vast San Bernardino. Use the interactive maps below to explore counties and their boundaries. Download free maps or learn more about creating a custom California county map to highlight your own data.

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Interactive Map of California Counties

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List of Counties (58)

List of 58 counties
#	County	County seat	Year founded	Population (2024)	Land area (sq mi)
1	Alameda	Oakland	1853	1,649,060	737.50
2	Alpine	Markleeville	1864	1099	738.30
3	Amador	Jackson	1854	42,026	594.60
4	Butte	Oroville	1850	208,334	1,636.50
5	Calaveras	San Andreas	1850	46,505	1020
6	Colusa	Colusa	1850	22,074	1,150.60
7	Contra Costa	Martinez	1850	1,172,607	716.90
8	Del Norte	Crescent City	1857	27,009	1,006.20
9	El Dorado	Placerville	1850	192,823	1,707.80
10	Fresno	Fresno	1856	1,024,125	5,958.60
11	Glenn	Willows	1891	28,304	1,313.90
12	Humboldt	Eureka	1853	132,380	3,568
13	Imperial	El Centro	1907	181,724	4,175.50
14	Inyo	Independence	1866	18,485	10,197.30
15	Kern	Bakersfield	1866	922,529	8,134.70
16	Kings	Hanford	1893	154,913	1391
17	Lake	Lakeport	1861	67,764	1,255.10
18	Lassen	Susanville	1864	28,340	4,541.40
19	Los Angeles	Los Angeles	1850	9,757,179	4,060.30
20	Madera	Madera	1893	165,432	2,136.70
21	Marin	San Rafael	1850	256,400	520.10
22	Mariposa	Mariposa	1850	17,048	1,448.80
23	Mendocino	Ukiah	1850	89,175	3,506.80
24	Merced	Merced	1855	296,774	1938
25	Modoc	Alturas	1874	8,491	3,948.20
26	Mono	Bridgeport	1861	12,991	3,048.90
27	Monterey	Salinas	1850	436,251	3,281.70
28	Napa	Napa	1850	132,727	752
29	Nevada	Nevada City	1851	102,195	957.80
30	Orange	Santa Ana	1889	3,170,435	793.20
31	Placer	Auburn	1851	433,822	1,407.40
32	Plumas	Quincy	1854	18,834	2,553.10
33	Riverside	Riverside	1893	2,529,933	7,209
34	Sacramento	Sacramento	1850	1,611,231	965.40
35	San Benito	Hollister	1874	69,159	1,388.70
36	San Bernardino	San Bernardino	1853	2,214,281	20,068.40
37	San Diego	San Diego	1850	3,298,799	4,210.90
38	San Francisco	San Francisco	1850	827,526	46.70
39	San Joaquin	Stockton	1850	816,108	1,392.30
40	San Luis Obispo	San Luis Obispo	1850	281,843	3,300.80
41	San Mateo	Redwood City	1856	742,893	448.60
42	Santa Barbara	Santa Barbara	1850	444,500	2,733.90
43	Santa Clara	San Jose	1850	1,926,325	1,291.10
44	Santa Cruz	Santa Cruz	1850	262,406	445.10
45	Shasta	Redding	1850	181,121	3,775.60
46	Sierra	Downieville	1852	3,113	953.20
47	Siskiyou	Yreka	1852	42,498	6,278.80
48	Solano	Fairfield	1850	455,101	821.70
49	Sonoma	Santa Rosa	1850	485,375	1,575.30
50	Stanislaus	Modesto	1854	556,972	1,496.20
51	Sutter	Yuba City	1850	98,545	602.70
52	Tehama	Red Bluff	1856	64,451	2,949.10
53	Trinity	Weaverville	1850	15,642	3,179.30
54	Tulare	Visalia	1852	483,546	4,823.90
55	Tuolumne	Sonora	1850	53,893	2,220.90
56	Ventura	Ventura	1872	835,427	1,840.80
57	Yolo	Woodland	1850	225,251	1013
58	Yuba	Marysville	1850	87,469	632

California Counties: Key Facts

Number of counties: 58
Largest county by area: San Bernardino County - 20 105 square miles
Smallest county by land area: San Francisco County - 47 square miles
Most populous county: Los Angeles County - approx. 9.7 million residents
Counties with major cities: Los Angeles (Los Angeles), San Diego (San Diego), Santa Clara (San Jose), Alameda (Oakland)
Time zone: Entire state observes Pacific Time
Neighboring states: California borders Oregon, Nevada, and Arizona
International border: with Baja California, Mexico
The City and County of San Francisco is California’s only consolidated city-county
California began statehood in 1850 with 27 counties
County boundaries largely unchanged since 1907, when Imperial County was created from eastern San Diego County