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
Maps and coordinates
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 80448 Grant Park County 303, 719, 720, 970, 983
CO 80449 Hartsel Park County 719
CO 80451 Hot Sulphur Springs Grand County 970
CO 80452 Idaho Springs Clear Creek County 303, 720, 970, 983
CO 80453 Idledale Jefferson County 303, 720, 983
CO 80454 Indian Hills Jefferson County 303, 720, 983
CO 80455 Jamestown Boulder County 303, 720, 983
CO 80456 Jefferson Park County 303, 719, 720, 970, 983
CO 80457 Kittredge Jefferson County 303, 720, 983
CO 80459 Kremmling Grand County 970
Page 21 of 67

Geographic Map of Colorado

Postal context

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.