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 95412 Annapolis Sonoma County 707
CA 95415 Boonville Mendocino County 707
CA 95416 Boyes Hot Springs Sonoma County 707
CA 95417 Branscomb Mendocino County 707
CA 95418 Calpella Mendocino County 707
CA 95419 Camp Meeker Sonoma County 707
CA 95420 Caspar Mendocino County 707
CA 95421 Cazadero Sonoma County 707
CA 95422 Clearlake Lake County 707
CA 95423 Clearlake Oaks Lake County 530, 707
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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.