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.

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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 95297 Stockton San Joaquin County 209
CA 95301 Atwater Merced County 209, 350
CA 95303 Ballico Merced County 209, 350
CA 95304 Tracy San Joaquin County 209, 350, 925
CA 95305 Big Oak Flat Tuolumne County 209, 350
CA 95306 Catheys Valley Mariposa County 209, 350
CA 95307 Ceres Stanislaus County 209, 350
CA 95309 Chinese Camp Tuolumne County 209, 350
CA 95310 Columbia Tuolumne County 209, 350
CA 95311 Coulterville Mariposa 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.