Modoc County was added from Siskiyou County.
San Benito County was added from Monterey County.
Klamath County was annexed into Humboldt County and Siskiyou County.
| 1 | Alameda | 2 | Alpine | 3 | Amador | 4 | Butte |
| 5 | Calaveras | 6 | Colusa | 7 | Contra Costa | 8 | Del Norte |
| 9 | El Dorado | 10 | Fresno | 12 | Humboldt | 14 | Inyo |
| 15 | Kern | 18 | Lake | 19 | Lassen | 20 | Los Angeles |
| 22 | Marin | 23 | Mariposa | 24 | Mendocino | 25 | Merced |
| 26 | Modoc | 27 | Mono | 28 | Monterey | 29 | Napa |
| 30 | Nevada | 32 | Placer | 33 | Plumas | 35 | Sacramento |
| 36 | San Benito | 37 | San Bernardino | 38 | San Diego | 39 | San Francisco |
| 40 | San Joaquin | 41 | San Luis Obispo | 42 | San Mateo | 43 | Santa Barbara |
| 44 | Santa Clara | 45 | Santa Cruz | 46 | Shasta | 47 | Sierra |
| 48 | Siskiyou | 49 | Solano | 50 | Sonoma | 51 | Stanislaus |
| 52 | Sutter | 53 | Tehama | 54 | Trinity | 55 | Tulare |
| 56 | Tuolumne | 57 | Ventura | 58 | Yolo | 59 | Yuba |