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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.

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Marin County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Marin County.

County State ZIP Code City Area Codes
Marin County CA 94901 San Rafael 415, 628
Marin County CA 94903 San Rafael 415, 628
Marin County CA 94904 Greenbrae 415, 628
Marin County CA 94912 San Rafael 415
Marin County CA 94913 San Rafael 415
Marin County CA 94914 Kentfield 415, 628
Marin County CA 94915 San Rafael 415
Marin County CA 94920 Belvedere Tiburon 415, 628
Marin County CA 94924 Bolinas 415, 628
Marin County CA 94925 Corte Madera 415, 628
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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.