| | Sonoma County | CA | 06097 | | Santa Rosa-Petaluma, CA 42220 | | Central | metro county (urban) | recreation | https://maps.google.com/?q=SonomaCounty+CA |
| | Stanislaus County | CA | 06099 | | Modesto, CA 33700 | San Jose-San
Francisco-Oakland, CA 488 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=StanislausCounty+California |
| | Sutter County | CA | 06101 | | Yuba City, CA 49700 | Sacramento-Roseville, CA 472 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=SutterCounty+CA |
| | Tulare County | CA | 06107 | | Visalia, CA 47300 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=TulareCounty+California |
| | Ventura County | CA | 06111 | | Oxnard-Thousand
Oaks-Ventura, CA 37100 | Los Angeles-Long Beach,
CA 348 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=VenturaCounty+CA |
| | Yolo County | CA | 06113 | | Sacramento-Roseville-Folsom,
CA 40900 | Sacramento-Roseville, CA 472 | Outlying | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=YoloCounty+CA |
| | Yuba County | CA | 06115 | | Yuba City, CA 49700 | Sacramento-Roseville, CA 472 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=YubaCounty+CA |
| | Alpine County | CA | 06003 | | Gardnerville Ranchos, NV 23820 | Reno-Carson
City-Gardnerville
Ranchos, NV-CA 456 | Outlying | nonmetro county (rural) | recreation | https://maps.google.com/?q=AlpineCounty+CA |
| | Amador County | CA | 06005 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=AmadorCounty+CA |
| | Calaveras County | CA | 06009 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=CalaverasCounty+CA |