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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State directory

Colorado ZIP Codes

Complete postal directory, details, and geographic map for the State of Colorado.

State ZIP Code City County Area Codes
CO 80632 Greeley Weld County 970
CO 80633 Greeley Weld County 970
CO 80634 Greeley Weld County 970
CO 80638 Greeley Weld County 970
CO 80639 Greeley Weld County 970
CO 80640 Henderson Adams County 303, 720, 983
CO 80642 Hudson Weld County 303, 720, 970, 983
CO 80643 Keenesburg Weld County 303, 720, 983
CO 80644 Kersey Weld County 303, 720, 970, 983
CO 80645 La Salle Weld County 303, 720, 970, 983
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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.