California County and City Codes
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) |