California

Admitted to the Union on September 9, 1850 as the 31st state.

  • 1850 federal census extant for all counties, except Contra Costa, San Francisco, and Santa Clara.
  • 1860 – 1940 federal censuses extant for all counties except for 1890.
Alameda Alpine Amador Butte
Calaveras Colusa Contra Costa Del Norte
El Dorado Fresno Glenn Humboldt
Imperial Inyo Kern Kings
Lake Lassen Los Angeles Madera
Marin Mariposa Mendocino Merced
Modoc Mono Monterey Napa
Nevada Orange Placer Plumas
Riverside Sacramento San Benito San Bernardino
San Diego San Francisco San Joaquin San Luis Obispo
San Mateo Santa Barbara Santa Clara Santa Cruz
Shasta Sierra Siskiyou Solano
Sonoma Stanislaus Sutter Tehama
Trinity Tulare Tuolumne Ventura
Yolo Yuba