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U.S. ZIP Codes Database 2026

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Weld County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Weld County.

County State ZIP Code City Area Codes
Weld County CO 80514 Dacono 303, 720, 983
Weld County CO 80516 Erie 303, 720, 983
Weld County CO 80520 Firestone 303, 720, 983
Weld County CO 80530 Frederick 303, 720, 983
Weld County CO 80534 Johnstown 970
Weld County CO 80542 Mead 303, 720, 970, 983
Weld County CO 80543 Milliken 970
Weld County CO 80546 Severance 970
Weld County CO 80550 Windsor 970
Weld County CO 80551 Windsor 970
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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.