There are 7 zip codes in Lake County, South Dakota. The most populated is 57042, located in Madison. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
570428,178Madison
570751,115Wentworth
57016704Chester
57054584Ramona
57076419Winfred
57057203Rutland
57050200Nunda

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