Warren County, Illinois

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Warren County is a county located in the U.S. state of Illinois. As of 2000, the population was 18,735. Its county seat is Monmouth, Illinois[1].

Warren County is part of the Galesburg Micropolitan Statistical Area.



Warren County was organized in 1825 out of Pike County. Pike County, consisted of all portions of 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 fall in the Revolutionary War.

The current courthouse, constructed of red Portage stone, was completed in 1895.

Warren County from the time of its creation to 1831

Between 1831 and 1835, Mercer County was temporarily attached to Warren until it could organize its own county government.[2]

Warren County between 1835 and 1841, when Henderson County was split off, reducing it to its current borders


According to the U.S. Census Bureau, the county has a total area of 543 square miles (1,407 km²), of which 543 square miles (1,405 km²) is land and 1 square mile (2 km²) (0.12%) is water.

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