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 80047 Aurora Arapahoe County 303
CO 80101 Agate Elbert County 303, 719, 720, 983
CO 80102 Bennett Adams County 303, 720, 983
CO 80103 Byers Arapahoe County 303, 719, 720, 970, 983
CO 80104 Castle Rock Douglas County 303, 720, 983
CO 80105 Deer Trail Arapahoe County 303, 719, 720, 970, 983
CO 80106 Elbert El Paso County 303, 719, 720, 983
CO 80107 Elizabeth Elbert County 303, 720, 983
CO 80108 Castle Rock Douglas County 303, 720, 983
CO 80109 Castle Rock Douglas County 303, 720, 983
Page 5 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.