There are 10 zip codes in Grant County, South Dakota. The most populated is 57252, located in Milbank. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
57252Milbank4,669
57216Big Stone City1,584
57259Revillo605
57266Summit571
57264Stockholm252
57256Ortley223
57265Strandburg204
57251Marvin191
57269Twin Brooks179
57246Labolt145

Grant County, South Dakota Zip Codes by Population (2024)