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ARTICLE VII ILLINOIS CONSTITUTION · 102 COUNTIES

Illinois County Map: All 102 Counties

Illinois contains 102 counties divided into two historical legal traditions: 85 township-organized counties and 17 southern commission counties. It is anchored by Cook County, the second-most populous county in the United States.

Data: 2020 Census & Census Gazetteer·Counties: 102

Illinois at a Glance

Total Counties1022020 Census units
State Population12,813,4692020 US Census Resident
Total Land Area55,519sq mi (143,794 km²)
Pop. Density230.8persons per sq mi
State CapitalSpringfieldSeat of government
State FIPS CodeFIPS 17USPS: IL · Central Time (CT)

Illinois County Map

Counties of Illinois with the state capital, Springfield, marked. Hover a shape for its name or click it to jump to its row in the list below.

Printable blank version (SVG, PNG, PDF)
Illinois counties mapFord CountySaline CountyHamilton CountyWinnebago CountyDeKalb CountyMarshall CountyPiatt CountyRichland CountyLogan CountyFayette CountyEffingham CountyKendall CountyKnox CountyLaSalle CountyTazewell CountyChristian CountyScott CountyGrundy CountyJefferson CountyPutnam CountyMarion CountyHenry CountyMacoupin CountyDe Witt CountyMcDonough CountyWayne CountySt. Clair CountyJasper CountyCumberland CountyBond CountyEdgar CountyOgle CountyJo Daviess CountyFulton CountyBureau CountyStephenson CountyPike CountyMason CountyLawrence CountyMcHenry CountyKane CountyDouglas CountyJersey CountyCass CountyMassac CountyMorgan CountyMercer CountySchuyler CountyWabash CountyFranklin CountyGallatin CountyGreene CountyEdwards CountyWarren CountyBrown CountyMontgomery CountyMadison CountyUnion CountyPope CountyClark CountyLee CountyShelby CountyCook CountyKankakee CountyPulaski CountyClay CountyVermilion CountyMenard CountyMonroe CountyRock Island CountyWilliamson CountyWoodford CountyHardin CountyAdams CountyIroquois CountyLivingston CountyHenderson CountyBoone CountyAlexander CountyCarroll CountyWill CountyStark CountyRandolph CountyLake CountyMacon CountyWashington CountyCrawford CountyCalhoun CountyMcLean CountyChampaign CountyClinton CountyHancock CountyWhiteside CountyWhite CountySangamon CountyMoultrie CountyJohnson CountyPeoria CountyJackson CountyColes CountyPerry CountyDuPage CountySpringfield
Source: US Census Bureau 2017 cartographic boundary file, 1:10,000,000 (generalized; via us-atlas).
FREE PRINTABLE VECTOR BLANK MAP

Printable Blank Map of Illinois with All Counties

Download the Illinois outline as SVG or PNG, or print it to PDF, in several variants: blank boundary, with counties lines, color-filled and labeled. Free to use (CC0).

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ADMINISTRATIVE FRAMEWORK & STATUTORY POWERS

How Local Government Operates in Illinois: Township County Boards vs. 3-Member Commissions

85 northern and central counties feature two-tier township governance with large County Boards. 17 southern counties operate under Virginia common-law tradition with 3-member Commissions and zero townships.

County Total102 CountiesEstablished between 1790 (St. Clair County) and 1859 (Ford County was the last).
Cook County Pop5,275,541 ResidentsSeat: Chicago. 2nd most populous county in US, containing ~41% of Illinois.
Township Split85 Township / 17 Non-TownshipHistoric cultural split between Yankee settlers (north) and Southern migrants (south).
Least PopulousHardin County (3,649)Seat: Elizabethtown. Scenic Ohio River bluff county in Shawnee National Forest.
Largest Land AreaMcLean County (1,183 sq mi)Seat: Bloomington. Prime agricultural corn and soybean prairie.
Special DistrictsHighest in US (6,900+)Illinois has more overlapping local taxing bodies than any other state.
IN-DEPTH STATUTORY & HISTORICAL ANALYSIS

Township vs. Non-Township Counties: Illinois’s Dual Settlement Heritage

Article VII of the Illinois Constitution preserves a geographic divide established during pioneer settlement in the 1840s.

Illinois is partitioned into two distinct county organizational forms. 85 northern and central counties operate under township organization: these counties are subdivided into civil townships (such as Evanston, Schaumburg, or Downers Grove) that handle local road maintenance and general assistance, with county governance managed by multi-member County Boards elected from districts.

In contrast, 17 southern Illinois counties (including Alexander, Calhoun, Edwards, Hardin, Johnson, Monroe, Morgan, Perry, Pope, Pulaski, Randolph, Scott, Union, and Wabash) were settled by pioneers from Kentucky and Virginia who opposed township bureaucracies.

These 17 counties operate under commission organization: they have no civil townships, and all county executive and legislative power is held by a compact 3-member Board of County Commissioners.

Cook County Board President

In Cook County, the County Board President is elected county-wide at-large and holds executive veto power over the 17-member Board of Commissioners.

IN-DEPTH STATUTORY & HISTORICAL ANALYSIS

Cook County & The Collar Counties: Urban-Suburban Metropolises

The northeastern corner of Illinois contains one of the most complex county metropolitan concentrations in the world.

Cook County encompasses the City of Chicago and over 130 suburban municipalities across 945 square miles, managing the largest unified court system in America (Cook County Circuit Court) and the massive Cook County Health hospital system (including John H. Stroger Jr. Hospital).

Surrounding Cook are the "Collar Counties" (DuPage, Lake, Will, Kane, and McHenry). These suburban counties have grown into major corporate, logistics, and residential powerhouses, coordinating transportation planning through the Regional Transportation Authority (RTA) and Metra commuter rail.

The Confluence at Cairo

Alexander County at the southern tip of Illinois sits at the confluence of the Ohio and Mississippi rivers, where the historic city of Cairo has faced extensive population decline.

LARGEST BY POPULATION & AREA

Illinois County Rankings: Population & Land Area

Comparative demographic and territorial distribution across Illinois's largest administrative subdivisions based on the 2020 US Census Decennial count.

Top 10 Most Populous Counties

41.2% in #1
#CountySeatPopulation% State
1Cook CountyChicago5,275,55541.2%
2DuPage CountyWheaton932,8847.3%
3Lake CountyWaukegan714,3365.6%
4Will CountyJoliet697,2985.4%
5Kane CountyGeneva516,5164.0%
6McHenry CountyWoodstock310,2132.4%
7Winnebago CountyRockford285,3372.2%
8Madison CountyEdwardsville265,8682.1%
9St. Clair CountyBelleville257,4122.0%
10Champaign CountyUrbana205,8731.6%

Top 10 Largest Counties by Land Area

2.1% in #1
#CountySeatLand Area% State
1McLean CountyBloomington1,183.2 sq mi2.1%
2LaSalle CountyOttawa1,135.2 sq mi2.0%
3Iroquois CountyWatseka1,117.4 sq mi2.0%
4Livingston CountyPontiac1,043.6 sq mi1.9%
5Champaign CountyUrbana996.1 sq mi1.8%
6Cook CountyChicago944.9 sq mi1.7%
7Vermilion CountyDanville898.3 sq mi1.6%
8Bureau CountyPrinceton869.1 sq mi1.6%
9Sangamon CountySpringfield868.3 sq mi1.6%
10Fulton CountyLewistown865.7 sq mi1.6%
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COMPLETE LIST (102 COUNTIES)

List of All 102 Counties in Illinois

Every county in Illinois is listed below with its seat, 2020 Census population, land area and FIPS code. Search by name, seat or FIPS, sort any column, or export the full table as CSV.

All 102 counties
County
Seat
2020 Census Pop
Land Area (sq mi)
FIPS
Cook County
Chicago5,275,555945 sq mi17031
DuPage County
Wheaton932,884328 sq mi17043
Lake County
Waukegan714,336444 sq mi17097
Will County
Joliet697,298836 sq mi17197
Kane County
Geneva516,516519 sq mi17089
McHenry County
Woodstock310,213603 sq mi17111
Winnebago County
Rockford285,337513 sq mi17201
Madison County
Edwardsville265,868716 sq mi17119
St. Clair County
Belleville257,412658 sq mi17163
Champaign County
Urbana205,873996 sq mi17019
Sangamon County
Springfield196,341868 sq mi17167
Peoria County
Peoria181,836619 sq mi17143
McLean County
Bloomington170,9561,183 sq mi17113
Rock Island County
Rock Island144,667428 sq mi17161
Kendall County
Yorkville131,868320 sq mi17093
Tazewell County
Pekin131,341647 sq mi17179
LaSalle County
Ottawa109,6501,135 sq mi17099
Kankakee County
Kankakee107,510677 sq mi17091
Macon County
Decatur103,984581 sq mi17115
DeKalb County
Sycamore100,422631 sq mi17037
Vermilion County
Danville74,204898 sq mi17183
Williamson County
Marion67,152420 sq mi17199
Adams County
Adams65,729855 sq mi17001
Whiteside County
Morrison55,694684 sq mi17195
Boone County
Belvidere53,451281 sq mi17007
Jackson County
Murphysboro52,966584 sq mi17077
Grundy County
Morris52,539418 sq mi17063
Ogle County
Oregon51,780759 sq mi17141
Knox County
Galesburg49,958716 sq mi17095
Henry County
Cambridge49,282823 sq mi17073
Coles County
Charleston46,864508 sq mi17029
Macoupin County
Carlinville44,973863 sq mi17117
Stephenson County
Freeport44,631564 sq mi17177
Woodford County
Eureka38,465528 sq mi17203
Franklin County
Benton, Illinois37,803409 sq mi17055
Marion County
Salem37,736573 sq mi17121
Jefferson County
Mount Vernon37,110571 sq mi17081
Clinton County
Carlyle36,893474 sq mi17027
Livingston County
Pontiac35,8271,044 sq mi17105
Monroe County
Waterloo34,953385 sq mi17133
Effingham County
Effingham34,676479 sq mi17049
Lee County
Dixon34,151725 sq mi17103
Christian County
Taylorville34,039710 sq mi17021
Fulton County
Lewistown33,608866 sq mi17057
Bureau County
Princeton33,243869 sq mi17011
Morgan County
Jacksonville32,920569 sq mi17137
Randolph County
Chester30,164575 sq mi17157
Montgomery County
Hillsboro28,283704 sq mi17135
Logan County
Lincoln27,995618 sq mi17107
McDonough County
Macomb27,232589 sq mi17109
Iroquois County
Watseka27,0821,117 sq mi17075
Saline County
Harrisburg23,772380 sq mi17165
Jo Daviess County
Galena22,043601 sq mi17085
Jersey County
Jerseyville21,518370 sq mi17083
Fayette County
Vandalia21,498716 sq mi17051
Shelby County
Shelbyville20,990759 sq mi17173
Perry County
Pinckneyville20,941442 sq mi17145
Douglas County
Tuscola19,736417 sq mi17041
Crawford County
Robinson18,674444 sq mi17033
Hancock County
Carthage17,613794 sq mi17067
Union County
Jonesboro17,239413 sq mi17181
Edgar County
Paris16,856623 sq mi17045
Warren County
Monmouth16,833542 sq mi17187
Bond County
Greenville16,725380 sq mi17005
Piatt County
Monticello16,676439 sq mi17147
Wayne County
Fairfield16,173714 sq mi17191
Richland County
Olney15,811360 sq mi17159
Carroll County
Mount Carroll15,707445 sq mi17015
Mercer County
Aledo15,698561 sq mi17131
De Witt County
Clinton15,520398 sq mi17039
Clark County
Marshall15,463501 sq mi17023
Lawrence County
Lawrenceville15,292372 sq mi17101
Pike County
Pittsfield14,734831 sq mi17149
Moultrie County
Sullivan14,527336 sq mi17139
Massac County
Metropolis14,170237 sq mi17127
White County
Carmi13,872495 sq mi17193
Washington County
Nashville13,758563 sq mi17189
Ford County
Paxton13,526486 sq mi17053
Johnson County
Vienna13,304344 sq mi17087
Clay County
Louisville13,289468 sq mi17025
Mason County
Havana13,091539 sq mi17125
Cass County
Virginia13,049376 sq mi17017
Menard County
Petersburg12,295314 sq mi17129
Greene County
Carrollton11,987543 sq mi17061
Marshall County
Lacon11,752387 sq mi17123
Wabash County
Mount Carmel11,362223 sq mi17185
Cumberland County
Toledo10,453346 sq mi17035
Jasper County
Newton9,287495 sq mi17079
Hamilton County
McLeansboro7,996435 sq mi17065
Schuyler County
Rushville6,899437 sq mi17169
Henderson County
Oquawka6,385379 sq mi17071
Edwards County
Albion6,245222 sq mi17047
Brown County
Mount Sterling6,240306 sq mi17009
Putnam County
Hennepin5,636160 sq mi17155
Stark County
Toulon5,395288 sq mi17175
Alexander County
Cairo5,239235 sq mi17003
Pulaski County
Mound City5,190199 sq mi17153
Scott County
Winchester4,947251 sq mi17171
Gallatin County
Shawneetown4,944323 sq mi17059
Calhoun County
Hardin4,438254 sq mi17013
Pope County
Golconda3,764369 sq mi17151
Hardin County
Elizabethtown3,647177 sq mi17069
Data: US Census Bureau 2020 Decennial Census populations and Census Gazetteer land areas.
All 102 rows shown · sortable · CSV export
REGIONAL BORDERING JURISDICTIONS

Neighboring States Bordering Illinois

County maps, lists and printable blank maps for the states that border Illinois:

IN92 Counties

Indiana

County Map & ListPrintable Blank Map
IA99 Counties

Iowa

County Map & ListPrintable Blank Map
MI83 Counties

Michigan

County Map & ListPrintable Blank Map
KY120 Counties

Kentucky

County Map & ListPrintable Blank Map
MO115 Counties

Missouri

County Map & ListPrintable Blank Map
WI72 Counties

Wisconsin

County Map & ListPrintable Blank Map
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Data Sources & FIPS Codes

Illinois uses state FIPS code 17; each county adds a three-digit code to form the five-digit FIPS (now INCITS 31) identifiers in the table. Populations are 2020 Census counts and land areas come from the Census Gazetteer. The map above is drawn from the Census Bureau's generalized 2017 cartographic boundary file (1:10,000,000), so it suits overview and printing, not parcel-level or legal boundary questions; for those, check the local assessor or GIS office.

FREQUENTLY ASKED QUESTIONS

Questions About Illinois Counties

Why do some Illinois counties have townships while others do not?

Northern and central Illinois were settled by New Englanders who brought the democratic town-meeting tradition (creating civil townships in 85 counties). Southern Illinois was settled by migrants from Virginia and Kentucky who preferred the Southern county commission model with no townships (retained in 17 counties).

What is the largest county in Illinois by land area?

McLean County (seat: Bloomington) is the largest county by land area in Illinois, covering 1,183.4 square miles in the heart of the central Illinois agricultural belt.

Is Chicago in more than one county?

The vast majority of Chicago is located in Cook County. A small portion of O’Hare International Airport extends into neighboring DuPage County.

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