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 57311 Alexandria Hanson County 605
SD 57312 Alpena Jerauld County 605
SD 57313 Armour Douglas County 605
SD 57314 Artesian Sanborn County 605
SD 57315 Avon Bon Homme County 402, 531, 605
SD 57317 Bonesteel Gregory County 402, 531, 605
SD 57319 Bridgewater McCook County 605
SD 57321 Canova Miner County 605
SD 57322 Carpenter Beadle County 605
SD 57323 Carthage Miner County 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.