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
County directory

Douglas County ZIP Codes

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

County State ZIP Code City Area Codes
Douglas County CO 80104 Castle Rock 303, 720, 983
Douglas County CO 80108 Castle Rock 303, 720, 983
Douglas County CO 80109 Castle Rock 303, 720, 983
Douglas County CO 80116 Franktown 303, 720, 983
Douglas County CO 80118 Larkspur 303, 719, 720, 983
Douglas County CO 80124 Lone Tree 303, 720, 983
Douglas County CO 80125 Littleton 303, 720, 983
Douglas County CO 80126 Littleton 303, 720, 983
Douglas County CO 80129 Littleton 303, 720, 983
Douglas County CO 80130 Littleton 303, 720, 983
Page 1 of 17

Geographic Map of Douglas County

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.