| | San Mateo County | CA | 06081 | San Francisco-San
Mateo-Redwood City, CA 41884 | San
Francisco-Oakland-Fremont,
CA 41860 | San Jose-San
Francisco-Oakland, CA 488 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=SanMateoCounty+CA |
| | Santa Barbara County | CA | 06083 | | Santa Maria-Santa
Barbara, CA 42200 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=SantaBarbaraCounty+CA |
| | Santa Clara County | CA | 06085 | | San Jose-Sunnyvale-Santa
Clara, CA 41940 | San Jose-San
Francisco-Oakland, CA 488 | Central | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=SantaClaraCounty+CA |
| | Santa Cruz County | CA | 06087 | | Santa Cruz-Watsonville,
CA 42100 | San Jose-San
Francisco-Oakland, CA 488 | Central | metro county (urban) | recreation | https://maps.google.com/?q=SantaCruzCounty+CA |
| | Shasta County | CA | 06089 | | Redding, CA 39820 | Redding-Red Bluff, CA 454 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ShastaCounty+CA |
| | Sierra County | CA | 06091 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=SierraCounty+CA |
| | Siskiyou County | CA | 06093 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=SiskiyouCounty+CA |
| | Solano County | CA | 06095 | | Vallejo, CA 46700 | San Jose-San
Francisco-Oakland, CA 488 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=SolanoCounty+CA |
| | 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 |