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 94971 Tomales Marin County 415, 628, 707
CA 94972 Valley Ford Sonoma County 707
CA 94973 Woodacre Marin County 415, 628
CA 94974 San Quentin Marin County 415
CA 94975 Petaluma Sonoma County 707
CA 94976 Corte Madera Marin County 415
CA 94977 Larkspur Marin County 415
CA 94978 Fairfax Marin County 415
CA 94979 San Anselmo Marin County 415
CA 94998 Novato 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.