Union County, Iowa ZIP Codes

Zip Code
City
Population ↓
50801Creston9,034
50830Afton1,846
50861Shannon City311
50254Thayer296
50842Cromwell99
50831Arispe22

Overview of ZIP Codes in Union 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.
6
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 6 ZCTAs in Union County, Iowa (US Census).

Sources

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

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