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.

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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 94954 Petaluma Sonoma County 415, 628, 707
CA 94955 Petaluma Sonoma County 707
CA 94956 Point Reyes Station Marin County 415, 628, 707
CA 94957 Ross Marin County 415, 628
CA 94960 San Anselmo Marin County 415, 628
CA 94963 San Geronimo Marin County 415, 628
CA 94964 San Quentin Marin County 415, 628
CA 94965 Sausalito Marin County 415, 628
CA 94966 Sausalito Marin County 415
CA 94970 Stinson Beach Marin County 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.