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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State directory

California ZIP Codes

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

State ZIP Code City County Area Codes
CA 96120 Markleeville Alpine County 530, 775
CA 96121 Milford Lassen County 530
CA 96122 Portola Plumas County 530
CA 96123 Ravendale Lassen County 530, 775
CA 96124 Calpine Sierra County 530
CA 96125 Sierra City Sierra County 530
CA 96126 Sierraville Sierra County 530
CA 96127 Susanville Lassen County 530
CA 96128 Standish Lassen County 530
CA 96129 Beckwourth Plumas County 530
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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.