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 95568 Somes Bar Siskiyou County 530
CA 95569 Redcrest Humboldt County 707
CA 95570 Trinidad Humboldt County 707
CA 95571 Weott Humboldt County 707
CA 95573 Willow Creek Humboldt County 530, 707
CA 95585 Leggett Mendocino County 707
CA 95587 Piercy Mendocino County 707
CA 95589 Whitethorn Humboldt County 707
CA 95595 Zenia Trinity County 530, 707
CA 95601 Amador City Amador County 209, 350
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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.