Illinois Counties Map

Illinois (IL) on the US Map

The State of Illinois highlighted on the US map.
The State of Illinois highlighted on the US map.

Map of Illinois Counties

Below is a map of the 102 counties of Illinois (you can click on the map to enlarge it and to see the major city in each state).

Illinois counties map showing counties, main cities, rivers, and neighboring states.
Illinois Counties Map with cities.

Click on any of the counties on the map to see the county’s population, economic data, time zone, and zip code (the data will appear below the map). Data is sourced from the US Census 2021.

List of the Counties of Illinois:

CountyPopulationPer sq. kmLargest City
Adams County65,87829.74Quincy
Alexander County5,4889Cairo
Bond County16,80417.06Greenville
Boone County53,59273.71Belvidere
Brown County6,3307.99Mount Sterling
Bureau County33,33814.81Peru
Calhoun County4,5376.9Hardin
Carroll County15,58613.51Savanna
Cass County13,05813.42Beardstown
Champaign County206,58380.07Champaign
Christian County34,03818.52Taylorville
Clark County15,58712Marshall
Clay County13,31310.98Flora
Clinton County37,04830.18Centralia
Coles County47,54236.11Charleston
Cook County5,265,3982151.47Chicago
Crawford County18,82516.38Robinson
Cumberland County10,52811.75Casey
De Witt County15,65315.2Clinton
DeKalb County100,92261.72DeKalb
Douglas County19,70818.26Tuscola
DuPage County934,0941100.23Chicago
Edgar County16,99810.53Paris
Edwards County6,23310.82Albion
Effingham County34,57627.88Effingham
Fayette County21,51411.59Vandalia
Ford County13,58910.8Paxton
Franklin County38,06835.94West Frankfort
Fulton County34,02215.17Canton
Gallatin County5,0386.02Shawneetown
Greene County12,1878.66Carrollton
Grundy County52,36448.35Morris
Hamilton County8,0217.13McLeansboro
Hancock County17,7508.63Hamilton
Hardin County3,7008.05Rosiclare
Henderson County6,4856.61Oquawka
Henry County49,41223.18Kewanee
Iroquois County27,3629.45Watseka
Jackson County53,67635.51Carbondale
Jasper County9,3247.28Newton
Jefferson County37,36225.25Mount Vernon
Jersey County21,53322.5Jerseyville
Jo Daviess County21,99514.13Galena
Johnson County13,23814.87Vienna
Kane County518,648385.57Aurora
Kankakee County108,10461.7Kankakee
Kendall County130,757157.65Aurora
Knox County50,19327.05Galesburg
Lake County714,484621.85Round Lake Beach
LaSalle County109,98637.41Ottawa
Lawrence County15,46516.04Lawrenceville
Lee County34,37318.31Dixon
Livingston County35,90213.28Streator
Logan County28,23817.64Lincoln
Macon County104,33169.38Decatur
Macoupin County45,15220.2Carlinville
Madison County266,112143.6Alton
Marion County37,78125.48Centralia
Marshall County11,78111.76Henry
Mason County13,2259.47Havana
Massac County14,28023.25Metropolis
McDonough County27,74318.18Macomb
McHenry County310,749198.84Crystal Lake
McLean County171,45555.95Bloomington
Menard County12,34315.16Petersburg
Mercer County15,77910.86Aledo
Monroe County34,73234.8Columbia
Montgomery County28,48215.63Litchfield
Morgan County33,18922.52Jacksonville
Moultrie County14,63416.82Sullivan
Ogle County51,78726.36Rockford
Peoria County182,439113.85Peoria
Perry County21,15818.49Du Quoin
Piatt County16,66414.65Monticello
Pike County14,9236.93Pittsfield
Pope County3,8204Golconda
Pulaski County5,27910.23Mounds
Putnam County5,63813.6Granville
Randolph County30,63220.56Chester
Richland County15,87617.03Olney
Rock Island County144,694130.68Moline
Saline County23,86924.25Harrisburg
Sangamon County196,75987.5Springfield
Schuyler County6,9536.14Rushville
Scott County4,9237.58Winchester
Shelby County21,16010.77Pana
St. Clair County258,597151.8Belleville
Stark County5,4367.29Wyoming
Stephenson County44,81730.67Freeport
Tazewell County131,97778.82Pekin
Union County17,25916.12Anna
Vermilion County74,95332.22Danville
Wabash County11,41419.73Mount Carmel
Warren County16,88712.02Monmouth
Washington County13,8279.49Centralia
Wayne County16,2508.79Fairfield
White County13,95910.89Carmi
Whiteside County55,93231.57Sterling
Will County696,403321.68Aurora
Williamson County67,27161.81Marion
Winnebago County285,471214.83Rockford
Woodford County38,57128.23Eureka