Washington County, Illinois ZIP Codes

Zip Code
City
Population ↓
62263Nashville4,819
62271Okawville1,873
62808Ashley1,602
62803Hoyleton1,132
62214Addieville1,048
62268Oakdale764
62848Irvington738
62877Richview437
62831Du Bois339
62876Radom146

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.
10
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 10 ZCTAs in Washington County, Illinois (US Census).

Sources

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

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