Names in CAPITALS denote counties which are wholly contained within the boundaries of the district.

District      Counties

 1      DEL NORTE, HUMBOLDT, LAKE, MENDOCINO, NAPA, Solano, Sonoma
 2      Butte, LASSEN, MODOC, NEVADA, PLUMAS, SHASTA, SIERRA, SISKIYOU, TRINITY, YUBA
 3      Butte, COLUSA, GLENN, Sacramento, Solano, SUTTER, TEHAMA, YOLO
 4      ALPINE, AMADOR, CALAVERAS, EL DORADO, MONO, PLACER, Sacramento, TUOLUMNE
 5      Sacramento
 6      MARIN, Sonoma
 7      Contra Costa, Solano
 8      San Francisco
 9      Alameda
10      Alameda, Contra Costa
11      Sacramento, San Joaquin
12      San Francisco, San Mateo
13      Alameda, Santa Clara
14      San Mateo, Santa Clara
15      Santa Clara, Santa Cruz
16      Santa Clara
17      MONTEREY, SAN BENITO, Santa Cruz
18      Fresno, Madera, MERCED, San Joaquin, STANISLAUS
19      Fresno, Madera, MARIPOSA, Tulare
20      Fresno, Kern, KINGS, Tulare
21      Kern, Tulare
22      SAN LUIS OBISPO, Santa Barbara
23      Santa Barbara, Ventura
24      Los Angeles, Ventura
25      Los Angeles
26      Los Angeles
27      Los Angeles
28      Los Angeles
29      Los Angeles
30      Los Angeles
31      Los Angeles
32      Los Angeles
33      Los Angeles
34      Los Angeles
35      Los Angeles
36      Los Angeles
37      Los Angeles
38      Los Angeles
39      Los Angeles, Orange
40      INYO, San Bernardino
41      Los Angeles, Orange, San Bernardino
42      San Bernardino
43      Riverside
44      Riverside
45      Orange
46      Orange
47      Orange
48      Orange, Riverside, San Diego
49      San Diego
50      San Diego
51      San Diego
52      IMPERIAL, San Diego