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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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Harding County ZIP Codes

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

County State ZIP Code City Area Codes
Harding County NM 87730 Mills 575
Harding County NM 87733 Mosquero 575
Harding County NM 87743 Roy 575
Harding County SD 57650 Ralph 605, 701
Harding County SD 57651 Reva 605
Harding County SD 57720 Buffalo 605, 701
Harding County SD 57724 Camp Crook 406, 605, 701
Harding County SD 57755 Ludlow 605, 701
Harding County SD 57776 Redig 605

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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.