California Department of Transportation

Quick Facts by County

Click on a county on the map, or choose a county name from the alphabetical list on the right to view the Quick Facts document for that county.

Del Norte County Siskiyou County Modoc County Humboldt County Trinity County Shasta County Lassen County Mendocino County Tehema County Plumas County Glenn County Butte County Sierra County Lake County Colusa County Sonoma County Napa County Yolo County Sutter County Yuba County Nevada County Placer County Sacramento County Marin County San Francisco County Solano County El Dorado County Amador County Contra Costa County Alpine County San Mateo County Alameda County San Joaquin County Calaveras County Santa Cruz County Santa Clara County Stanislaus County Tuolumne County Merced County Mariposa County Mono County Inyo County Monterey County San Benito County Fresno County Madera County Kings County Tulare County San Luis Obispo County Kern County San Bernardino County Riverside County Santa Barbara Ventura County Los Angeles County Orange County San Diego County Imperial County