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 94563 Orinda Contra Costa County 341, 510, 925
CA 94564 Pinole Contra Costa County 341, 510, 925
CA 94565 Pittsburg Contra Costa County 707, 925
CA 94566 Pleasanton Alameda County 925
CA 94567 Pope Valley Napa County 707
CA 94568 Dublin Alameda County 341, 510, 925
CA 94569 Port Costa Contra Costa County 341, 510, 925
CA 94570 Moraga Contra Costa County 925
CA 94571 Rio Vista Solano County 279, 707, 916, 925
CA 94572 Rodeo Contra Costa County 341, 510, 925
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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.