There are 8 zip codes in Warren County, Illinois. The most populated is 61462, located in Monmouth. * 2024 populations estimated based on the latest ACS 5-year data.

CSV JSON
Zip Code
Population
City
6146210,855Monmouth
614731,307Roseville
614471,133Kirkwood
61453691Little York
61423497Cameron
61478383Smithshire
61417237Berwick
61435155Gerlaw

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