Addresses for County Courthouse and IRAD:
 

Warren County Courthouse 100 West Broadway Monmouth, IL 61462
Telephone:	County Clerk Circuit Clerk Recorder	(309) 734-8592 (309) 734-5179 (309) 734-8592
IRAD Depository University Library Western Illinois University 1 University Circle Macomb, IL 61455
Telephone: (309) 298-2716

Established:		January 13, 1825 (Laws, 1825, p. 93)
		County organization was completed in July, 1830.
Origin of the name of the county:
	Named for Joseph Warren, a physician and soldier who served at Lexington, a Major General of the Massachusetts militia. He was killed at the battle of Bunker Hill.
Present area, or parts of it, formerly included in:
	1826–1830	Attached to Peoria County (Laws, 1826, p. 76–77)
	1825–1826	Attached to Schuyler County (Laws, 1825, p. 95)
	1812–1825	Pike
	1812–1821	Madison
	1795–1812	St. Clair
County Seats:
	1830–1831	House of Alexis Phelps, at Lower Yellow Banks, now Oquawka—Temporary designation.
	1831–	Monmouth
History of county governing board:
	1830–1849	County Commissioners’ Court
	1849–1854	County Court
	1854–	County Board of Supervisors
Township Government
	Adopted:	November 8, 1853
Township Names:
	Berwick
	Cold Brook
	Ellison
	Floyd
	Greenbush
	Hale
	Kelly	Name changed from Warren on May 8, 1855.
	Lenox	Name changed from Ripley on May 8, 1855.
	Monmouth
	Point Pleasant
	Roseville
	Spring Grove
	Sumner	Name changed from Union on May 8, 1855.
	Swan
	Tompkins