| | | Trinity County | CA | 06105 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=TrinityCounty+CA |
| | | Alameda County | CA | 06001 | Oakland-Fremont-Berkeley,
CA 36084 | San
Francisco-Oakland-Fremont,
CA 41860 | San Jose-San
Francisco-Oakland, CA 488 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=AlamedaCounty+CA |
| | | Butte County | CA | 06007 | | Chico, CA 17020 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ButteCounty+CA |
| | | Del Norte County | CA | 06015 | | Crescent City, CA 18860 | Brookings-Crescent City,
OR-CA 152 | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=DelNorteCounty+CA |
| | | El Dorado County | CA | 06017 | | Sacramento-Roseville-Folsom,
CA 40900 | Sacramento-Roseville, CA 472 | Central | metro county (urban) | recreation | https://maps.google.com/?q=ElDoradoCounty+CA |
| | | Fresno County | CA | 06019 | | Fresno, CA 23420 | Fresno-Hanford-Corcoran,
CA 260 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=FresnoCounty+CA |
| | | Humboldt County | CA | 06023 | | Eureka-Arcata, CA 21700 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=HumboldtCounty+CA |
| | | Imperial County | CA | 06025 | | El Centro, CA 20940 | | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=ImperialCounty+CA |
| | | Inyo County | CA | 06027 | | Bishop, CA 13860 | | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=InyoCounty+CA |
| | | Kern County | CA | 06029 | | Bakersfield-Delano, CA 12540 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=KernCounty+CA |
