Winneshiek County, Iowa ZIP Codes

7 ZIP Codes

Zip Code
City
Population ↓
52101Decorah12,706
52132Calmar1,759
52161Ossian1,532
52165Ridgeway1,098
52144Fort Atkinson1,075
52133Castalia673
52168Spillville356

Overview of ZIP Codes in Winneshiek 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 Winneshiek County, Iowa (US Census).

Sources

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

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