There are 7 zip codes in Monroe County, Illinois. The most populated is 62298, located in Waterloo. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6229817,192Waterloo
6223614,630Columbia
622951,449Valmeyer
62244933Fults
62248540Hecker
6227970Renault
6225634Maeystown
showing: 7 rows

Zip Codes in Monroe County, Illinois by Population (2024)