Warren County, Illinois Zip Codes

Zip Code	City	Population
61462	Monmouth	10,855
61473	Roseville	1,307
61447	Kirkwood	1,133
61453	Little York	691
61423	Cameron	497
61478	Smithshire	383
61417	Berwick	237
61435	Gerlaw	155

Population is the most recent figure from the U.S. Census Bureau's 2022 American Community Survey (ACS) 5-Year Estimates.