What are the Lake Madison, South Dakota Zip Codes for 2020, 2019Primary Zip Codes for Lake MadisonZip CodePrimary CitySecondary City57075WentworthLake Madison, Smiths ParkCities sharing Zip Codes with Lake MadisonZip CodePrimary CitySecondary CityMore Information57075WentworthSmiths Park57075WentworthLake Madison Lake Madison population stats Advertisements