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U.S. ZIP Codes Database 2026

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Custer County ZIP Codes

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

County State ZIP Code City Area Codes
Custer County CO 81252 Westcliffe 719
Custer County CO 81253 Wetmore 719
Custer County ID 83226 Challis 208, 986
Custer County ID 83227 Clayton 208, 986
Custer County ID 83235 Ellis 208, 986
Custer County ID 83251 Mackay 208, 986
Custer County ID 83253 May 208, 986
Custer County ID 83278 Stanley 208, 986
Custer County MT 59301 Miles City 406
Custer County MT 59336 Ismay 406
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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.