There are 7 zip codes in Dewey County, South Dakota. The most populated is 57625, located in Eagle Butte. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
576253,906Eagle Butte
576013,514Mobridge
57656842Timber Lake
57652409Ridgeview
57661183Whitehorse
5763677Lantry
5763031Glencross

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