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
Population
City
572524,669Milbank
572161,584Big Stone City
57259605Revillo
57266571Summit
57264252Stockholm
57256223Ortley
57265204Strandburg
57251191Marvin
57269179Twin Brooks
57246145Labolt

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