| | Modoc County | CA | 06049 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=ModocCounty+CA |
| | Mono County | CA | 06051 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=MonoCounty+CA |
| | Monterey County | CA | 06053 | | Salinas, CA 41500 | | Central | metro county (urban) | recreation | https://maps.google.com/?q=MontereyCounty+CA |
| | Napa County | CA | 06055 | | Napa, CA 34900 | San Jose-San
Francisco-Oakland, CA 488 | Central | metro county (urban) | recreation | https://maps.google.com/?q=NapaCounty+CA |
| | Nevada County | CA | 06057 | | Truckee-Grass Valley, CA 46020 | Sacramento-Roseville, CA 472 | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=NevadaCounty+CA |
| | Placer County | CA | 06061 | | Sacramento-Roseville-Folsom,
CA 40900 | Sacramento-Roseville, CA 472 | Central | metro county (urban) | recreation | https://maps.google.com/?q=PlacerCounty+CA |
| | Plumas County | CA | 06063 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=PlumasCounty+CA |
| | Riverside County | CA | 06065 | | Riverside-San
Bernardino-Ontario, CA 40140 | Los Angeles-Long Beach,
CA 348 | Central | metro county (urban) | recreation | https://maps.google.com/?q=RiversideCounty+CA |
| | Sacramento County | CA | 06067 | | Sacramento-Roseville-Folsom,
CA 40900 | Sacramento-Roseville, CA 472 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=SacramentoCounty+CA |
| | San Benito County | CA | 06069 | | San Jose-Sunnyvale-Santa
Clara, CA 41940 | San Jose-San
Francisco-Oakland, CA 488 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=SanBenitoCounty+CA |