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 80487 Steamboat Springs Routt County 970
CO 80488 Steamboat Springs Routt County 970
CO 80497 Silverthorne Summit County 970
CO 80498 Silverthorne Summit County 303, 720, 970, 983
CO 80501 Longmont Boulder County 303, 720, 983
CO 80502 Longmont Boulder County 303
CO 80503 Longmont Boulder County 303, 720, 970, 983
CO 80504 Longmont Boulder County 303, 720, 970, 983
CO 80510 Allenspark Boulder County 303, 720, 970, 983
CO 80511 Estes Park Larimer County 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.