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Warren County, Illinois

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Warren County, Illinois
Warren County Courthouse in Monmouth — Public domain, Nyttend · source

About Warren County

Warren County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 16,835. Its county seat is Monmouth.

Description adapted from Wikipedia, CC BY-SA 4.0.

Warren County at a glance

County seat
Monmouth
Population
16,835 (2020)
Land area
543 sq mi
Founded
1825

Largest communities in Warren County

  1. Monmouth Township9,975
  2. Monmouth County seat8,902
  3. Roseville Township1,135
  4. Spring Grove Township929
  5. Tompkins Township900

History of Warren County

Warren County was organized in 1825 out of Pike County which consisted of all portions of the state north and west of the Illinois River before 1825. Henderson County was formed in 1841 from the western area of Warren County. Warren County was named for Dr. Joseph Warren, killed at the Battle of Bunker Hill in 1775. He is believed to have been the first officer to die in the Revolutionary War. The current courthouse, constructed of red Portage stone, was completed in 1895.

Adapted from Wikipedia, CC BY-SA 4.0.

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  2. 02

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Official channels

Warren County election resources

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Part of Illinois Voter Check

This is the Warren County page of Illinois Voter Check, a project of True the Vote, pointing Illinois voters at the official tools that already exist — and at Scan Check Protect to verify your registration.

Where anything here differs from what Warren County or the Illinois State Board of Elections publishes, they are right and this page is not.