The list is the FIPS codes of California counties. All the FIPS codes are starting with 06.
| County | FIPS Code |
| Alameda | 06001 |
| Alpine | 06003 |
| Amador | 06005 |
| Butte | 06007 |
| Calaveras | 06009 |
| Colusa | 06011 |
| Contra Costa | 06013 |
| Del Norte | 06015 |
| El Dorado | 06017 |
| Fresno | 06019 |
| Glenn | 06021 |
| Humboldt | 06023 |
| Imperial | 06025 |
| Inyo | 06027 |
| Kern | 06029 |
| Kings | 06031 |
| Lake | 06033 |
| Lassen | 06035 |
| Los Angeles | 06037 |
| Madera | 06039 |
| Marin | 06041 |
| Mariposa | 06043 |
| Mendocino | 06045 |
| Merced | 06047 |
| Modoc | 06049 |
| Mono | 06051 |
| Monterey | 06053 |
| Napa | 06055 |
| Nevada | 06057 |
| Orange | 06059 |
| Placer | 06061 |
| Plumas | 06063 |
| Riverside | 06065 |
| Sacramento | 06067 |
| San Benito | 06069 |
| San Bernardino | 06071 |
| San Diego | 06073 |
| San Francisco | 06075 |
| San Joaquin | 06077 |
| San Luis Obispo | 06079 |
| San Mateo | 06081 |
| Santa Barbara | 06083 |
| Santa Clara | 06085 |
| Santa Cruz | 06087 |
| Shasta | 06089 |
| Sierra | 06091 |
| Siskiyou | 06093 |
| Solano | 06095 |
| Sonoma | 06097 |
| Stanislaus | 06099 |
| Sutter | 06101 |
| Tehama | 06103 |
| Trinity | 06105 |
| Tulare | 06107 |
| Tuolumne | 06109 |
| Ventura | 06111 |
| Yolo | 06113 |
| Yuba | 06115 |
All codes are cited from United States Department of Agriculture [28].