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.

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Colorado ZIP Codes

Complete postal directory, details, and geographic map for the State of Colorado.

State ZIP Code City County Area Codes
CO 80001 Arvada Jefferson County 303
CO 80002 Arvada Jefferson County 303, 720, 983
CO 80003 Arvada Jefferson County 303, 720, 983
CO 80004 Arvada Jefferson County 303, 720, 983
CO 80005 Arvada Jefferson County 303, 720, 983
CO 80006 Arvada Jefferson County 303
CO 80007 Arvada Jefferson County 303, 720, 983
CO 80010 Aurora Arapahoe County 303, 720, 983
CO 80011 Aurora Arapahoe County 303, 720, 983
CO 80012 Aurora Arapahoe 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.