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
All states and U.S. territories
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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 80291 Denver Denver County 303
CO 80293 Denver Denver County 303, 720, 983
CO 80294 Denver Denver County 303, 720, 983
CO 80295 Denver Denver County 720
CO 80299 Denver Denver County 303, 720
CO 80301 Boulder Boulder County 303, 720, 983
CO 80302 Boulder Boulder County 303, 720, 983
CO 80303 Boulder Boulder County 303, 720, 983
CO 80304 Boulder Boulder County 303, 720, 983
CO 80305 Boulder Boulder County 303, 720, 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.