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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 94946 Nicasio 415, 628, 707
Marin County CA 94947 Novato 415, 628, 707
Marin County CA 94948 Novato 415
Marin County CA 94949 Novato 415, 628
Marin County CA 94950 Olema 415, 628
Marin County CA 94956 Point Reyes Station 415, 628, 707
Marin County CA 94957 Ross 415, 628
Marin County CA 94960 San Anselmo 415, 628
Marin County CA 94963 San Geronimo 415, 628
Marin County CA 94964 San Quentin 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.