California has 58 Counties and 52 Congressional Districts: 36 counties are wholly within a congressional district; 22 counties are divided among more than one congressional district.
UNDIVIDED COUNTIES (those wholly within one Congressional District):
- CD # 1: Del Norte, Humboldt, Lake, Mendocino and Napa
- CD # 2: Lassen, Modoc, Nevada, Plumas, Shasta, Sierra, Siskiyou, Trinity and Yuba
- CD # 3: Colusa, Glenn, Sutter, Tehama and Yolo
- CD # 4: Alpine, Amador, Calaveras, El Dorado, Mono, Placerand Tuolumne
- CD # 6: Marin
- CD # 17: Monterey and San Benito
- CD # 18: Merced and Stanislaus
- CD # 19: Mariposa
- CD # 20: Kings
- CD # 22: San Luis Obispo
- CD # 40: Inyo
- CD # 52: Imperial
DIVIDED COUNTIES (those split among more than one Congressional District):
- Alameda: CDs 9, 10 and 13 [CD # 9 is wholly within Alameda County]
- Butte: CDs 2 and 3
- Contra Costa: CDs 7 and 10
- Fresno: CDs 18, 19 and 20
- Kern: CDs 20 and 21
- Los Angeles: CDs 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 and 41 [CDs # 25, # 26, # 27, # 28, # 29, # 30, # 31, # 32, # 33, # 34, # 35, # 36, # 37 and # 38 are all wholly within Los Angeles County]
- Madera: CDs 18 and 19
- Orange: CDs 39, 41, 45, 46, 47 and 48 [CDs # 45, # 46 and # 47 are wholly within Orange County]
- Riverside: CDs 43, 44 and 48 [CDs # 43 and # 44 are wholly within Riverside County]
- Sacramento: CDs 3, 4 and 5 [CD # 5 is wholly within Sacramento County]
- San Bernardino: CDs 40, 41 and 42 [CD # 42 is wholly within San Bernardino County]
- San Diego: CDs 48, 49, 50, 51 and 52 [CDs # 49, # 50 and # 51 are wholly within San Diego County]
- San Francisco (coterminous with the City of San Francisco): CDs 8 and 12 [CD # 8 is wholly within the City and County of San Francisco]
- San Joaquin: CDs 11 and 18
- San Mateo: CDs 12 and 14
- Santa Barbara: CDs 22 and 23
- Santa Clara: CDs 13, 14, 15 and 16 [CD # 16 is wholly within Santa Clara County]
- Santa Cruz: CDs 15 and 17
- Solano: CDs 1, 3 and 7
- Sonoma: CDs 1 and 6
- Tulare: CDs 19, 20 and 21
- Ventura: CDs 23 and 24
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