County Locations Amador County, Butte County, Calaveras County, Colusa County, Del Norte County, El Dorado County, Glenn County, Humboldt County, Lake County, Marin County, Mendocino County, Napa County, Nevada County, Placer County, Sacramento County, San Joaquin County, Shasta County, Solano County, Sonoma County, Stanislaus County, Sutter County, Trinity County, Tuolum