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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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Pennington County ZIP Codes

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

County State ZIP Code City Area Codes
Pennington County SD 57751 Keystone 605
Pennington County SD 57761 New Underwood 605
Pennington County SD 57767 Owanka 605
Pennington County SD 57775 Quinn 605
Pennington County SD 57780 Scenic 605
Pennington County SD 57790 Wall 605
Pennington County SD 57791 Wasta 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.