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.

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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 57626 Faith Meade County 605
SD 57630 Glencross Dewey County 605
SD 57631 Glenham Walworth County 605
SD 57632 Herreid Campbell County 605, 701
SD 57633 Isabel Dewey County 605
SD 57634 Keldron Corson County 605, 701
SD 57636 Lantry Dewey County 605
SD 57638 Lemmon Perkins County 605, 701
SD 57639 Little Eagle Corson County 605
SD 57640 Lodgepole Perkins County 605, 701
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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.