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| A list of counties in Illinois and
related data including year formed, square miles of area, population,
and population density. |
| County |
Formed |
Sq. Miles |
Pop* |
Maps |
| Adams |
|
| |
|
| Alexander |
|
|
|
|
| Bond |
|
| |
|
| Boone |
|
|
|
|
| Brown |
|
| |
|
| Bureau |
|
|
|
|
| Calhoun |
|
| |
|
| Carroll |
|
|
|
|
| Cass |
|
| |
|
| Champaign |
|
|
|
|
| Christian |
|
| |
|
| Clark |
|
|
|
|
| Clay |
|
| |
|
| Clinton |
|
|
|
|
| Coles |
|
| |
|
| Crawford
|
|
|
|
|
|
Cumberland
|
|
| |
|
| DeKalb |
|
|
|
|
| DeWitt |
| |
|
|
| Douglas |
| |
|
|
| Edgar |
| |
|
|
| Edwards |
| |
|
|
| Effingham
|
| |
|
|
| Fayette
|
| |
|
|
| Ford
|
| |
|
|
|
Franklin
|
| |
|
|
|
Fulton
|
| |
|
|
|
Gallatin
|
| |
|
|
| Greene
|
| |
|
|
| Grundy
|
| |
|
|
|
Hamilton
|
| |
|
|
| Hancock
|
| |
|
|
| Hardin
|
| |
|
|
|
Henderson
|
| |
|
|
| Henry
|
| |
|
|
| Iroquois
|
| |
|
|
|
Jackson
|
| |
|
|
| Jasper
|
| |
|
|
|
Jefferson
|
| |
|
|
|
Jersey
|
| |
|
|
| JoDaviess
|
| |
|
|
| Johnson
|
| |
|
|
| Kane
|
| |
|
|
|
Kankakee
|
| |
|
|
|
Kendall
|
| |
|
|
| Knox
|
| |
|
|
|
Lake
|
| |
|
|
| LaSalle
|
| |
|
|
|
Lawrence
|
| |
|
|
| Lee
|
| |
|
|
|
Livingston
|
| |
|
|
|
Logan
|
| |
|
|
|
Macon
|
| |
|
|
| Macoupin
|
| |
|
|
|
Madison
|
| |
|
|
|
Marion
|
| |
|
|
|
Marshall
|
| |
|
|
| Mason
|
| |
|
|
| Massac
|
| |
|
|
| McDonough
|
| |
|
|
| McHenry
|
| |
|
|
|
McLean
|
| |
|
|
| Menard
|
| |
|
|
| Mercer
|
| |
|
|
|
Monroe
|
| |
|
|
|
Montgomery
|
| |
|
|
| Morgan
|
| |
|
|
|
Moultrie
|
| |
|
|
| Ogle
|
| |
|
|
|
Peoria
|
| |
|
|
| Perry
|
| |
|
|
| Piatt
|
| |
|
|
| Pike
|
| |
|
|
| Pope
|
| |
|
|
| Pulaski
|
| |
|
|
| Putnam
|
| |
|
|
|
Randolph
|
| |
|
|
|
Richland
|
| |
|
|
|
Rock Island
|
| |
|
|
| Saline
|
| |
|
|
|
Sangamon
|
| |
|
|
| Schuyler
|
| |
|
|
| Scott
|
| |
|
|
|
Shelby
|
| |
|
|
| St. Clair
|
| |
|
|
| Stark
|
| |
|
|
| Stephenson
|
| |
|
|
| Tazewell
|
| |
|
|
|
Union
|
| |
|
|
| Vermilion
|
| |
|
|
|
Wabash
|
| |
|
|
|
Warren
|
|
|
|
|
|
Washington
|
|
|
|
|
|
Wayne
|
|
|
|
|
| White
|
|
|
|
|
| Whiteside |
|
|
|
|
| Will |
|
|
|
|
| Williamson |
|
|
|
|
| Winnebago |
|
|
|
|
| Woodford |
|
|
|
|
| |
|
|
|
|
| |
|
|
|
|
| |
|
|
|
|
| |
|
|
|
|
| |
|
|
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| |
|
|
|
|
| Total |
|
|
|
|
|
| *2000 census density people per square
mile.. |
| |
| |
|
Related Links & Resources:
●
Illinois National Forests
●
Illinois National Parks
●
Illinois National Wildlife Refuges
●
Illinois Wildlife Management Areas
● Illinois
Lakes
●
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