100 W. Broadway
Monmouth, IL 61462-1761
Phone: (309) 734-8592
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.
Wyatt Earp was born in Monmouth, Warren County, Illinois.