Illinois County Map

All 102 counties with county seats and major cities

Illinois has 102 counties, the seventh-highest total among the states. This map shows all 102 counties and their county seats. Tap a county for details, or download the free printable map below.

Illinois county map showing all 102 counties with county names and county seats
Map of Illinois counties with county seats (dots) and the state capital, Springfield (star). Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).

Updated October 4, 2026 · Boundaries: U.S. Census Bureau 2025 · Population: Census estimates for July 1, 2025

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Illinois county facts

Number of counties
102
Largest by land area
McLean County 1,183 sq mi
Smallest by land area
Putnam County 160.1 sq mi
Most people
Cook County 5,194,625
Fewest people
Hardin County 3,588
Fastest growing since 2020
Kendall County +10.3%
Highest median household income
DuPage County $112,096
Oldest county
St. Clair County est. 1790
Newest county
Douglas County est. 1859
State capital
Springfield Sangamon County

List of 102 Illinois counties

Sorted A–Z. Click a column to sort, or a name to show it on the map. Download as CSV

CountyCounty seatPopulation 2025Change since 2020Land area (sq mi)Median incomeEstablishedFIPS
Adams CountyQuincy64,267−2.3%855$66,220182517001
Alexander CountyCairo4,570−12.8%235$47,043181917003
Bond CountyGreenville16,959+0.4%380$65,959181717005
Boone CountyBelvidere53,568+0.2%281$84,571183717007
Brown CountyMount Sterling6,401+2.5%306$67,917183917009
Bureau CountyPrinceton32,510−2.3%869$69,257183717011
Calhoun CountyHardin4,300−2.9%254$93,203182517013
Carroll CountyMount Carroll15,419−1.9%445$60,758183917015
Cass CountyVirginia12,463−4.4%376$68,125183717017
Champaign CountyUrbana209,972+1.7%996$63,683183317019
Christian CountyTaylorville33,443−1.8%710$62,611183917021
Clark CountyMarshall15,114−2.4%501$72,927181917023
Clay CountyLouisville12,793−3.7%468$60,417182417025
Clinton CountyCarlyle37,128+0.6%474$86,588182417027
Coles CountyCharleston46,607−1.2%508$56,478183017029
Cook CountyChicago5,194,625−1.6%945$83,498183117031
Crawford CountyRobinson18,648−0%444$71,674181617033
Cumberland CountyToledo10,208−2.3%346$73,327184317035
De Witt CountyClinton15,118−2.5%398$71,678183917039
DeKalb CountySycamore101,835+1.3%631$70,724183717037
Douglas CountyTuscola19,880+0.7%417$77,320185917041
DuPage CountyWheaton934,298+0.1%328$112,096183917043
Edgar CountyParis16,323−3.3%623$59,941182317045
Edwards CountyAlbion5,898−5.5%222$60,519181417047
Effingham CountyEffingham34,519−0.4%479$80,404183117049
Fayette CountyVandalia20,790−3.3%717$60,944182117051
Ford CountyPaxton13,216−2.3%486$62,439185917053
Franklin CountyBenton36,916−2.3%409$56,740181817055
Fulton CountyLewistown32,901−2.3%866$60,599182317057
Gallatin CountyShawneetown4,616−6.6%323$59,219181217059
Greene CountyCarrollton11,313−5.5%543$62,192182117061
Grundy CountyMorris54,052+2.8%418$92,235184117063
Hamilton CountyMcLeansboro7,859−1.7%435$65,746182117065
Hancock CountyCarthage16,803−4.8%794$65,865182517067
Hardin CountyElizabethtown3,588−1.9%177$54,271183917069
Henderson CountyOquawka5,984−6.4%379$62,227184117071
Henry CountyCambridge48,095−2.4%823$71,911182517073
Iroquois CountyWatseka26,150−3.4%1,117$66,255183317075
Jackson CountyMurphysboro52,501−1.6%584$48,763181617077
Jasper CountyNewton9,032−2.9%495$74,755183117079
Jefferson CountyMount Vernon36,147−2.6%571$63,118181917081
Jersey CountyJerseyville21,160−1.7%370$80,361183917083
Jo Daviess CountyGalena21,594−2.2%601$73,993182717085
Johnson CountyVienna13,363+0.4%344$62,528181217087
Kane CountyGeneva525,757+1.8%519$103,163183617089
Kankakee CountyKankakee105,525−2%677$71,281185317091
Kendall CountyYorkville145,470+10.3%320$111,601184117093
Knox CountyGalesburg47,767−4.4%716$57,030182517095
LaSalle CountyOttawa107,773−1.7%1,135$73,045183117099
Lake CountyWaukegan719,339+0.7%444$110,416183917097
Lawrence CountyLawrenceville13,790−9.9%372$55,324182117101
Lee CountyDixon32,914−3.6%725$70,292183917103
Livingston CountyPontiac35,057−2.2%1,044$73,790183717105
Logan CountyLincoln27,182−2.9%618$66,358183917107
Macon CountyDecatur99,300−4.5%581$62,666182917115
Macoupin CountyCarlinville43,748−2.9%863$70,805182917117
Madison CountyEdwardsville263,110−1.1%716$75,793181217119
Marion CountySalem36,382−3.6%573$61,240182317121
Marshall CountyLacon11,473−2.4%387$71,585183917123
Mason CountyHavana12,411−5.1%539$62,845184117125
Massac CountyMetropolis13,502−4.8%237$65,116184317127
McDonough CountyMacomb25,916−4.9%589$52,795182617109
McHenry CountyWoodstock317,751+2.4%603$104,802183617111
McLean CountyBloomington171,419+0.1%1,183$79,905183017113
Menard CountyPetersburg11,863−3.5%314$82,176183917129
Mercer CountyAledo15,229−3%561$74,182182517131
Monroe CountyWaterloo34,840−0.3%385$102,880181617133
Montgomery CountyHillsboro28,076−0.9%704$63,620182117135
Morgan CountyJacksonville32,515−3.1%569$66,306182317137
Moultrie CountySullivan14,371−1.1%336$71,784184317139
Ogle CountyOregon51,399−0.9%759$82,132183617141
Peoria CountyPeoria178,553−1.9%619$65,108182517143
Perry CountyPinckneyville20,160−3.7%442$62,118182717145
Piatt CountyMonticello16,791+0.6%439$94,811184117147
Pike CountyPittsfield14,231−3.4%831$59,777182117149
Pope CountyGolconda3,672−2.5%369$60,050181617151
Pulaski CountyMound City4,820−7.4%199$42,463184317153
Putnam CountyHennepin5,619−0.2%160$75,590182517155
Randolph CountyChester29,921−0.8%575$68,131179517157
Richland CountyOlney15,219−3.8%360$62,455184117159
Rock Island CountyRock Island141,869−1.9%428$67,159183117161
Saline CountyHarrisburg22,772−4.4%380$53,117184717165
Sangamon CountySpringfield194,170−1.1%868$75,357182117167
Schuyler CountyRushville6,657−3.5%437$65,948182517169
Scott CountyWinchester4,866−4.1%251$66,705183917171
Shelby CountyShelbyville20,576−2%759$72,095182717173
St. Clair CountyBelleville250,708−2.7%658$73,854179017163
Stark CountyToulon5,319−1.4%288$62,878183917175
Stephenson CountyFreeport43,220−3.3%564$64,043183717177
Tazewell CountyPekin130,049−1.2%647$77,982182717179
Union CountyJonesboro16,656−4%413$55,728181817181
Vermilion CountyDanville71,259−4%898$56,877182617183
Wabash CountyMount Carmel10,907−4%223$57,086182417185
Warren CountyMonmouth16,222−3.7%542$67,385182517187
Washington CountyNashville13,564−1.5%563$78,224181817189
Wayne CountyFairfield15,882−1.9%714$55,521181917191
White CountyCarmi13,250−4.5%495$54,813181517193
Whiteside CountyMorrison54,121−2.8%684$67,500183617195
Will CountyJoliet712,253+2.1%836$109,984183617197
Williamson CountyMarion67,225+0.1%420$65,604183917199
Winnebago CountyRockford283,674−0.6%513$65,837183617201
Woodford CountyEureka38,111−0.9%528$91,483184117203

Illinois county map with cities

The largest cities in Illinois and the counties they are in. Cities that cross a county line list every county, the main one first. To find any smaller town, use the search box above.

Illinois county map with cities and county seats
Illinois counties with county seat towns. Download the full-size image
CityCountyPopulation 2025
ChicagoCook and DuPage counties2,731,585
AuroraKane, DuPage, Will and Kendall counties181,505
NapervilleDuPage and Will counties153,114
JolietWill and Kendall counties152,241
RockfordWinnebago and Ogle counties147,384
ElginKane and Cook counties115,476
SpringfieldSangamon County112,989
PeoriaPeoria County110,920
ChampaignChampaign County91,195
WaukeganLake County87,940
CiceroCook County81,858
BloomingtonMcLean County78,804
SchaumburgCook and DuPage counties77,249
EvanstonCook County76,380
Arlington HeightsCook County76,216
BolingbrookWill and DuPage counties74,803
DecaturMacon County67,884
SkokieCook County66,544
PalatineCook County65,842
Des PlainesCook County58,772
Orland ParkCook and Will counties57,954
Oak LawnCook County56,450
Mount ProspectCook County55,395
Tinley ParkCook and Will counties55,140
BerwynCook County55,001
WheatonDuPage County54,065
NormalMcLean County53,275
Oak ParkCook County52,823
Hoffman EstatesCook County50,858
Downers GroveDuPage County50,365

Printable Illinois county maps (free PDF, PNG, SVG)

Every map is free to print and share. The PDFs are vector files with real text, so they stay sharp at any size and you can search them for a county name. Use 11×17 (tabloid) for the most readable labels.

Illinois county map with all 102 counties labeled

Color map with names

All 102 counties labeled, county seats marked. Letter and 11×17 PDF, high-resolution PNG, editable SVG.

Illinois county map with cities

Map with cities

Counties with their county seat towns and major cities.

Blank outline map of Illinois counties

Blank outline map

County lines only, no names. For quizzes, coloring and your own notes.

Illinois county map with numbers

Numbered map with key

A number in every county with an alphabetical key.

Black and white Illinois county map

Black and white

Labeled map that prints well on any printer.

Map of Illinois counties shaded by population density

Population map

Counties shaded by population density (2025 estimates).

Data and GIS files

The county table as CSV, and the boundaries as GeoJSON and KML (Google Earth, Google My Maps).

How Illinois got 102 counties

Illinois's first county, St. Clair, was organized by proclamation of Northwest Territory governor Arthur St. Clair on April 27, 1790. Fifteen counties existed when Illinois became a state in 1818. Three of them, Madison, Bond and Crawford, had reached north to the Canadian border until statehood cut them off at the state line. The General Assembly then divided these huge early counties into smaller ones. In 1821 it drew Fayette County around the new capital at Vandalia; it covered nearly 7,000 square miles and included parts of 18 present-day counties. By the end of 1839 there were 87 counties. Fifteen more followed, ending with Douglas and Ford in 1859. Thirteen other counties, among them Michigan, Coffee and Oregon, were authorized by the legislature but never completed their organization.

Regions of Illinois

Illinois's counties grouped into the 10 Illinois economic development regions (DCEO) (source).

Northern Stateline

Boone, Ogle, Stephenson, Winnebago

Northwest

Bureau, Carroll, Henry, Jo Daviess, LaSalle, Lee, Mercer, Putnam, Rock Island, Whiteside

Northeast

Cook, DeKalb, DuPage, Grundy, Kane, Kankakee, Kendall, Lake, McHenry, Will

North Central

DeWitt, Fulton, Livingston, Marshall, Mason, McLean, Peoria, Stark, Tazewell, Woodford

East Central

Champaign, Douglas, Ford, Iroquois, Piatt, Vermilion

West Central

Adams, Brown, Hancock, Henderson, Knox, McDonough, Pike, Schuyler, Warren

Central

Cass, Christian, Greene, Logan, Macon, Macoupin, Menard, Montgomery, Morgan, Sangamon, Scott, Shelby

Southeast

Clark, Clay, Coles, Crawford, Cumberland, Edgar, Effingham, Fayette, Jasper, Lawrence, Marion, Moultrie, Richland

Southwest

Bond, Calhoun, Clinton, Jersey, Madison, Monroe, Randolph, St. Clair, Washington

Southern

Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson, Johnson, Massac, Perry, Pope, Pulaski, Saline, Union, Wabash, Wayne, White, Williamson

County maps of neighboring states

Illinois counties: questions and answers

How many counties are in Illinois?
Illinois has 102 counties.
What is the largest county in Illinois?
By land area, McLean County is the largest (1,183 sq mi). By population, Cook County is the largest, with 5,194,625 people (2025 estimate).
What is the smallest county in Illinois?
Putnam County is the smallest by land area (160.1 sq mi). Hardin County has the fewest people: 3,588 (2025 estimate).
What is the wealthiest county in Illinois?
By median household income, DuPage County ranks first with $112,096 (American Community Survey 2020–2024). The lowest is Pulaski County at $42,463.
What county is Chicago in?
Chicago is mostly in Cook County, with smaller parts in DuPage County.
What county is Aurora in?
Aurora is mostly in Kane County, with smaller parts in DuPage, Will and Kendall counties.
What county is Naperville in?
Naperville is mostly in DuPage County, with smaller parts in Will County.
What county is Springfield in?
Springfield, the state capital, is in Sangamon County.
How can I see county lines on Google Maps?
Google Maps does not draw county lines. Download the KML file from the printable maps section above and import it into Google My Maps (Create a new map › Import) or open it in Google Earth to see every Illinois county boundary on top of Google's map.
Can I use this map for free?
Yes. The maps and files on this page are free to print, share and use in your own work, including commercial projects, under the CC BY 4.0 licence. Please credit “WhichCounty (whichcounty.com)”.

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Sources and methodology

Found an error? Tell us. Last data update: October 4, 2026.