Warren County, Illinois ZIP Codes

8 ZIP Codes

Zip Code
City
Population ↓
61462Monmouth10,458
61473Roseville1,279
61447Kirkwood1,020
61453Little York677
61423Cameron638
61478Smithshire420
61435Gerlaw271
61417Berwick182

Overview of ZIP Codes in Warren 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.
8
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 8 ZCTAs in Warren County, Illinois (US Census).

Sources

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

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