U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
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California ZIP Codes

Complete postal directory, details, and geographic map for the State of California.

State ZIP Code City County Area Codes
CA 94805 Richmond Contra Costa County 341, 510
CA 94806 San Pablo Contra Costa County 341, 510
CA 94807 Richmond Contra Costa County 510
CA 94808 Richmond Contra Costa County 510
CA 94820 El Sobrante Contra Costa County 510
CA 94850 Richmond Contra Costa County 510
CA 94901 San Rafael Marin County 415, 628
CA 94903 San Rafael Marin County 415, 628
CA 94904 Greenbrae Marin County 415, 628
CA 94912 San Rafael Marin County 415
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.