Lake County, South Dakota ZIP Codes

Zip Code
City
Population ↓
57042Madison7,756
57075Wentworth1,296
57054Ramona703
57016Chester676
57076Winfred325
57057Rutland196
57050Nunda176

Overview of ZIP Codes in Lake County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
7
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 7 ZCTAs in Lake County, South Dakota (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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