ILLINOIS STATE ARCHIVES
324 Main St.
Peoria, IL 61602
309-672-6070 — County Clerk
309-672-6015 — Circuit Clerk
309-672-6090 — Recorder
Western Illinois University
1 University Circle
Macomb, IL 61455-1390
January 13, 1825 (Laws, 1825, p. 85)
Origin of the name of the county
Named for the Indian tribe called the Peorias, one of the tribes from the Illinois confederacy.
Present area, or parts of it, formerly included in
1823–1825 — Fulton
1821–1823 — Pike
1817–1821 — Bond
1812–1821 — Madison
1801–1812 — St. Clair
1825– — Peoria
History of county governing board
1825–1850 — Commissioners’ Court
1850– — County Board of Supervisors
Adopted — November 6, 1849
City of Peoria — Organized in December, 1907, from parts of the original township of Peoria and Richwoods.
Kickapoo — Name changed from Orange (date unknown, probably 1850).
Medina — Name changed from Franklin (date unknown, probably 1850).
Radnor — Name changed from Benton to Fremont and then to Radnor (dates unknown, probably 1850).
Richwoods — Part of Richwoods was given to Town of the City of Peoria when it was organized in 1907.
West Peoria — Designation given to that part of the original township of Peoria not given to the Town of the City of Peoria in 1907. (See City of Peoria above.)
Federal Township Plats of Illinois
Illinois Public Domain Land Tract Sales Database
Illinois Statewide Death Index, 1916–1950
Illinois Statewide Marriage Index
Local Governmental Records Database
Name Index to Illinois Local Governments
Peoria County Probate Case Files Index (1825–1887)