Washington County, Iowa ZIP Codes

7 ZIP Codes

Zip Code
City
Population ↓
52353Washington9,241
52327Riverside3,796
52356Wellman2,664
52248Keota1,675
52201Ainsworth1,148
52621Crawfordsville604
52359West Chester308

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

Sources

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

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