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.

42,735 verified records
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State directory

South Dakota ZIP Codes

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

State ZIP Code City County Area Codes
SD 57246 Labolt Grant County 605
SD 57247 Lake City Marshall County 605
SD 57248 Lake Norden Hamlin County 605
SD 57249 Lake Preston Kingsbury County 605
SD 57251 Marvin Grant County 605
SD 57252 Milbank Grant County 320, 605
SD 57253 Milbank Grant County 605
SD 57255 New Effington Roberts County 605, 701
SD 57256 Ortley Grant County 605
SD 57257 Peever Roberts County 605
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Geographic Map of South Dakota

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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.