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U.S. District Courts for the Districts of California: Judicial District Organization, 1850-present

	Northern District of California	Southern District of California
September 28, 1850 9 Stat. 521	Counties of Butte, Calaveras, Colusi, Contra Costa, El Dorado, Marin, Mariposa (partial), Mendocino, Napa, Sacramento, San Francisco, San Joaquin, Santa Clara (partial), Santa Cruz (partial), Shasta, Solano, Sonoma, Sutter, Trinity, Tuolumne, Yolo, and Yuba. The statute assigned to the district all parts of the state north of the thirty-seventh parallel of north latitude.	Counties of Los Angeles, Mariposa (partial), Monterey, San Diego, San Luis Obispo, Santa Barbara, Santa Clara (partial), and Santa Cruz (partial). The statute assigned to the district all parts of the state south of the thirty-seventh parallel of north latitude.
July 27, 1866 14 Stat. 300	The statute reorganized the state as one judicial district.	The statute reorganized the state as one judicial district.
August 5, 1886 24 Stat. 308	Counties of Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Humboldt, Inyo, Lake, Lassen, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Placer, Plumas, Sacramento, San Benito, San Francisco, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tuolumne, Yolo, and Yuba.	Counties of Fresno, Kern, Los Angeles, San Bernardino, San Diego, San Luis Obispo, Santa Barbara, Tulare, and Ventura.
May 29, 1900 31 Stat. 219	Counties of Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Humboldt, Lake, Lassen, Marin, Mendocino, Modoc, Mono, Monterey, Napa, Nevada, Placer, Plumas, Sacramento, San Benito, San Francisco, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tuolumne, Yolo, and Yuba.	Counties of Fresno, Inyo, Kern, Los Angeles, Mariposa, Merced, San Bernardino, San Diego, San Luis Obispo, Santa Barbara, Tulare, and Ventura.
March 3, 1911 36 Stat. 1107	Counties of Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Glenn, Humboldt, Lake, Lassen, Marin, Mendocino, Modoc, Mono, Monterey, Napa, Nevada, Placer, Plumas, Sacramento, San Benito, San Francisco, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tuolumne, Yolo, and Yuba.	Counties of Fresno, Imperial, Inyo, Kern, Kings, Los Angeles, Madera, Mariposa, Merced, Orange, Riverside, San Bernardino, San Diego, San Luis Opisbo, Santa Barbara, Tulare, and Ventura.
June 2, 1920 41 Stat. 731	Counties of Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Glenn, Humboldt, Lake, Lassen, Marin, Mendocino, Modoc, Mono, Monterey, Napa, Nevada, Placer, Plumas, Sacramento, San Benito, San Francisco, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tuolumne, Yolo, and Yuba, and Yosemite National Park.	Counties of Fresno, Imperial, Inyo, Kern, Kings, Los Angeles, Madera (except Yosemite National Park), Mariposa (except Yosemite National Park), Merced, Orange, Riverside, San Bernardino, San Diego, San Luis Opisbo, Santa Barbara, Tulare, and Ventura, and General Grant and Sequoia National Parks.

	Central District of California	Eastern District of California	Northern District of California	Southern District of California
March 18, 1966 80 Stat. 75	Counties of Los Angeles, Orange, Riverside, San Bernardino, San Luis Obispo, Santa Barbara, and Ventura.	Counties of Alpine, Amador, Butte, Calaveras, Colusa, El Dorado, Fresno, Glenn, Inyo, Kern, Kings, Lassen, Madera, Mariposa, Merced, Modoc, Mono, Nevada, Placer, Plumas, Sacramento, San Joaquin, Shasta, Sierra, Siskiyou, Solano, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Yolo, and Yuba.	Counties of Alameda, Contra Costa, Del Norte, Humboldt, Lake, Marin, Mendocino, Monterey, Napa, San Benito, San Francisco, San Mateo, Santa Clara, Santa Cruz, and Sonoma.	Counties of Imperial and San Diego.
Historical county information obtained from William M. Scholl Center for American History and Culture, Atlas of Historical County Boundaries*, at The Newberry Library.

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