Original 27 Counties
On February 18, 1850, California’s first Governor, Peter Burnett, signed into law the creation of the state’s original counties. They were as follows:
Butte | Calaveras | Colusa |
Contra Costa | El Dorado | Los Angeles |
Marin | Mariposa | Mendocino |
Monterey | Napa | Sacramento |
San Diego | San Francisco | San Joaquin |
San Luis Obispo | Santa Barbara | Santa Clara |
Santa Cruz | Shasta | Solano |
Sonoma | Sutter | Trinity |
Tuolumne | Yolo | Yuba |