Monroe County, Illinois ZIP Codes

Zip Code
City
Population ↓
62298Waterloo18,208
62236Columbia14,154
62278Red Bud6,281
62295Valmeyer1,459
62244Fults928
62248Hecker521
62279Renault112
62256Maeystown35

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

Sources

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

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