ILLINOIS
Browse Illinois’ County Histories
Click on a county to see its history. Jurisdictions with resources have a green border. Those displayed in gray are counties or independent cities that are no longer active under their original designation; to delve deeper into the various reasons for their change, please visit our Understanding Extinct Counties page.
ADAMS COUNTY
ALEXANDER COUNTY
BOND COUNTY
BOONE COUNTY
BROWN COUNTY
BUREAU COUNTY
CALHOUN COUNTY
CARROLL COUNTY
CASS COUNTY
CHAMPAIGN COUNTY
CHRISTIAN COUNTY (FORMERLY DANE COUNTY)
CLARK COUNTY
CLAY COUNTY
CLINTON COUNTY
COLES COUNTY
COOK COUNTY
CRAWFORD COUNTY
CUMBERLAND COUNTY
DEKALB COUNTY
DEWITT COUNTY
DOUGLAS COUNTY
DUPAGE COUNTY
EDGAR COUNTY
EDWARDS COUNTY
EFFINGHAM COUNTY
FAYETTE COUNTY
FORD COUNTY
FRANKLIN COUNTY
FULTON COUNTY
GALLATIN COUNTY
GREENE COUNTY
GRUNDY COUNTY
HAMILTON COUNTY
HANCOCK COUNTY
HARDIN COUNTY
HENDERSON COUNTY
HENRY COUNTY
IROQUOIS COUNTY
JACKSON COUNTY
JASPER COUNTY
JEFFERSON COUNTY
JERSEY COUNTY
JO DAVIESS COUNTY
JOHNSON COUNTY
KANE COUNTY
KANKAKEE COUNTY
KENDALL COUNTY
KNOX COUNTY
LAKE COUNTY
LASALLE COUNTY
LAWRENCE COUNTY
LEE COUNTY
LIVINGSTON COUNTY
LOGAN COUNTY
MACON COUNTY
MACOUPIN COUNTY
MADISON COUNTY
MARION COUNTY
MARSHALL COUNTY
MASON COUNTY
MASSAC COUNTY
MCDONOUGH COUNTY
MCHENRY COUNTY
MCLEAN COUNTY
MENARD COUNTY
MERCER COUNTY
MONROE COUNTY
MONTGOMERY COUNTY
MORGAN COUNTY
MOULTRIE COUNTY
OGLE COUNTY
PEORIA COUNTY
PERRY COUNTY
PIATT COUNTY
PIKE COUNTY
POPE COUNTY
PULASKI COUNTY
RANDOLPH COUNTY
RICHLAND COUNTY
ROCK ISLAND COUNTY
SALINE COUNTY
SANGAMON COUNTY
SCHUYLER COUNTY
SCOTT COUNTY
SHELBY COUNTY
STARK COUNTY (FORMERLY COFFEE COUNTY)
STEPHENSON COUNTY
TAZEWELL COUNTY
UNION COUNTY
VERMILION COUNTY
WABASH COUNTY
WARREN COUNTY
WASHINGTON COUNTY
WAYNE COUNTY
WHITE COUNTY
WILL COUNTY
WILLIAMSON COUNTY
WINNEBAGO COUNTY
WOODFORD COUNTY