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Here is a listing of the 58 counties in California along with their 'official' numbers. If you see a double number the second number represents the county seat. Example: Alameda County is 01 and Oakland, the county seat of Alameda County is 60.
These numbers can be (and are) found on various indexes such as birth, marriage and death.
| Code |
County (Seat) |
Code |
County (Seat) |
| 01/60 |
Alameda (Oakland) |
30 |
Orange (Santa Ana) |
| 02 |
Alpine (Markleeville) |
31 |
Placer (Auburn) |
| 03 |
Amador (Jackson) |
32 |
Plumas (Quincy) |
| 04 |
Butte (Oroville) |
33 |
Riverside (Riverside) |
| 05 |
Calaveras (San Andreas) |
34 |
Sacramento (Sacramento) |
| 06 |
Colusa (Colusa) |
35 |
San Benito (Hollister) |
| 07 |
Contra Costa (Martinez) |
36 |
San Bernardino (San Bernardino) |
| 08 |
Del Norte (Crescent City) |
37/80 |
San Diego (San Diego) |
| 09 |
El Dorado (Placerville) |
38/90 |
San Francisco (San Francisco) |
| 10 |
Fresno (Fresno) |
39 |
San Joaquin (Stockton) |
| 11 |
Glenn (Willows) |
40 |
San Luis Obispo (San Luis Obispo) |
| 12 |
Humboldt (Eureka) |
41 |
San Mateo (Redwood City) |
| 13 |
Imperial (El Centro) |
42 |
Santa Barbara (Santa Barbara) |
| 14 |
Inyo (Independence) |
43 |
Santa Clara (San Jose) |
| 15 |
Kern (Bakersfield) |
44 |
Santa Cruz (Santa Cruz) |
| 16 |
Kings (Hanford) |
45 |
Shasta (Redding) |
| 14 |
Lake (Lakeport) |
46 |
Sierra (Downieville) |
| 18 |
Lassen (Susanville) |
47 |
Siskiyou (Yreka) |
| 19/70 |
Los Angeles (Los Angeles) |
48 |
Solano (Fairfield) |
| 20 |
Madera (Madera) |
49 |
Sonoma (Santa Rosa) |
| 21 |
Marin (San Rafael) |
50 |
Stanislaus (Modesto) |
| 22 |
Mariposa (Mariposa) |
51 |
Sutter (Yuba City) |
| 23 |
Mendocino (Uliah) |
52 |
Tehama (Red Bluff) |
| 24 |
Merced (Merced) |
53 |
Trinity (Weaverville) |
| 25 |
Modoc (Alturas) |
54 |
Tulare (Visalia) |
| 26 |
Mono (Bridgeport) |
55 |
Tuolumne (Sonora) |
| 27 |
Monterey (Salinas) |
56 |
Ventura (Ventura) |
| 28 |
Napa (Napa) |
57 |
Yolo (Woodland) |
| 29 |
Nevada (Nevada City) |
58 |
Yuba (Marysville) |
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