There are 4 zip codes in Custer County, South Dakota. The most populated is 57730, located in Custer. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
577305,809Custer
577442,243Hermosa
57738364Fairburn
57773221Pringle

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