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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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Yankton County ZIP Codes

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

County State ZIP Code City Area Codes
Yankton County SD 57031 Gayville 402, 531, 605
Yankton County SD 57037 Irene 605
Yankton County SD 57040 Lesterville 605
Yankton County SD 57046 Mission Hill 402, 531, 605
Yankton County SD 57067 Utica 605
Yankton County SD 57072 Volin 605
Yankton County SD 57078 Yankton 402, 531, 605
Yankton County SD 57079 Yankton 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.