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 94607 Oakland Alameda County 341, 415, 510, 628
CA 94608 Emeryville Alameda County 341, 510
CA 94609 Oakland Alameda County 341, 510
CA 94610 Oakland Alameda County 341, 510
CA 94611 Oakland Alameda County 341, 510, 925
CA 94612 Oakland Alameda County 341, 510
CA 94613 Oakland Alameda County 341, 510
CA 94614 Oakland Alameda County 510
CA 94615 Oakland Alameda County 415, 510, 925
CA 94617 Oakland Alameda County 415, 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.