Carroll County, Illinois ZIP Codes

7 ZIP Codes

Zip Code
City
Population ↓
61074Savanna3,962
61046Lanark2,794
61285Thomson2,728
61053Mount Carroll2,590
61051Milledgeville1,469
61078Shannon1,459
61014Chadwick1,067

Overview of ZIP Codes in Carroll 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 Carroll County, Illinois (US Census).

Sources

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

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