CountyAtlas

CountyAtlas Illinois

Illinois County Map with Cities — All 102 Counties

All 102 of Illinois's counties, mapped from official U.S. Census boundaries with population, income, and unemployment for every one. Colour the map by any measure, tap a county for its data, or download a print-ready copy.

Illinois CountiesFIPS 17
Adams CountyAlexander CountyBond CountyBoone CountyBrown CountyBureau CountyCalhoun CountyCarroll CountyCass CountyChampaign CountyChristian CountyClark CountyClay CountyClinton CountyColes CountyCook CountyCrawford CountyCumberland CountyDeKalb CountyDe Witt CountyDouglas CountyDuPage CountyEdgar CountyEdwards CountyEffingham CountyFayette CountyFord CountyFranklin CountyFulton CountyGallatin CountyGreene CountyGrundy CountyHamilton CountyHancock CountyHardin CountyHenderson CountyHenry CountyIroquois CountyJackson CountyJasper CountyJefferson CountyJersey CountyJo Daviess CountyJohnson CountyKane CountyKankakee CountyKendall CountyKnox CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan CountyMcDonough CountyMcHenry CountyMcLean CountyMacon CountyMacoupin CountyMadison CountyMarion CountyMarshall CountyMason CountyMassac CountyMenard CountyMercer CountyMonroe CountyMontgomery CountyMorgan CountyMoultrie CountyOgle CountyPeoria CountyPerry CountyPiatt CountyPike CountyPope CountyPulaski CountyPutnam CountyRandolph CountyRichland CountyRock Island CountySt. Clair CountySaline CountySangamon CountySchuyler CountyScott CountyShelby CountyStark CountyStephenson CountyTazewell CountyUnion CountyVermilion CountyWabash CountyWarren CountyWashington CountyWayne CountyWhite CountyWhiteside CountyWill CountyWilliamson CountyWinnebago CountyWoodford County
Albers Equal Area ConicDatum NAD83Census PEP · SAIPE · BLS LAUS · TIGER
CountyAtlasEdition
Illinois’s 102 counties, projected equal-area. Hover or tap a county for its name; select it for full data.
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Tap any county for its population, income, and more.

Illinois at a glance

  • Scale. Illinois is divided into 102 counties across 55,514 sq mi of land — an average of 544 sq mi each. Census TIGER
  • People. Its counties are home to 12,549,689 residents — an average of 123,036 each, or 226 per square mile statewide. Census PEP 2023
  • Water. Another 2,400 sq mi is water — 4.1% of the state’s area, led by Lake County. Census TIGER

Illinois’s 102 counties, by the numbers

Every county’s population, median household income, unemployment, density, and land area — sortable by any column, so you can find yours or rank by what matters to you. A few patterns run through the data:

  • Concentrated. Half of Illinois’s 12,549,689 residents live in just 3 of 102 counties, and the five largest hold 63.2% of the total. Census PEP 2023
  • Income tracks poverty. The gap from richest to poorest runs 2.5×, and the 10 highest-income counties average 6.8% in poverty against 19.5% for the 10 lowest. Census SAIPE 2023
  • Mostly small. Half of Illinois’s counties have fewer than 24,505 residents, and half report a median household income below $65,901 — a few metros lift the statewide totals well above both. Census PEP 2023 · SAIPE 2023
  • Lopsided density. Only 12 of 102 counties are denser than Illinois’s statewide average of 226 people per square mile — the rest are more rural. Census PEP 2023 · TIGER
Adams County64,441$63,4243.3%75/sq mi855 sq miQuincy
Alexander County4,695$45,5506.1%20/sq mi235 sq miCairo
Bond County16,450$66,1624.1%43/sq mi380 sq miGreenville
Boone County53,202$83,1294.7%189/sq mi281 sq miBelvidere
Brown County6,294$76,0762.9%21/sq mi306 sq miMount Sterling
Bureau County32,729$66,8544.6%38/sq mi869 sq miPrinceton
Calhoun County4,317$72,5744.2%17/sq mi254 sq miHardin
Carroll County15,526$61,9824.1%35/sq mi445 sq miMount Carroll
Cass County12,596$64,4133.9%34/sq mi376 sq miVirginia
Champaign County205,644$62,1694.0%206/sq mi996 sq miUrbana
Christian County33,228$72,6504.0%47/sq mi709 sq miTaylorville
Clark County15,088$66,9234.5%30/sq mi501 sq miMarshall
Clay County12,999$54,8374.1%28/sq mi468 sq miLouisville
Clinton County36,785$88,9773.2%78/sq mi474 sq miCarlyle
Coles County46,060$57,7283.7%91/sq mi508 sq miCharleston
Cook County5,087,072$80,5475.3%5,384/sq mi945 sq miChicago
Crawford County18,300$64,1683.8%41/sq mi444 sq miRobinson
Cumberland County10,261$71,7413.1%30/sq mi346 sq miToledo
De Witt County15,365$74,5533.8%39/sq mi398 sq miClinton
DeKalb County100,288$69,4394.1%159/sq mi631 sq miSycamore
Douglas County19,629$82,8953.5%47/sq mi417 sq miTuscola
DuPage County921,213$107,0324.4%2,809/sq mi328 sq miWheaton
Edgar County16,334$59,3304.0%26/sq mi623 sq miParis
Edwards County5,968$59,8679.6%27/sq mi222 sq miAlbion
Effingham County34,331$72,1583.3%72/sq mi479 sq miEffingham
Fayette County21,164$61,9524.5%30/sq mi716 sq miVandalia
Ford County13,250$71,1104.0%27/sq mi486 sq miPaxton
Franklin County37,138$52,5334.7%91/sq mi409 sq miBenton
Fulton County32,541$62,9144.4%38/sq mi866 sq miLewistown
Gallatin County4,670$56,8524.7%14/sq mi323 sq miShawneetown
Greene County11,543$59,1463.6%21/sq mi543 sq miCarrollton
Grundy County53,578$91,2544.6%128/sq mi418 sq miMorris
Hamilton County7,911$65,4724.0%18/sq mi435 sq miMcLeansboro
Hancock County17,186$63,4083.4%22/sq mi794 sq miCarthage
Hardin County3,569$51,2164.2%20/sq mi177 sq miElizabethtown
Henderson County6,088$62,6103.5%16/sq mi379 sq miOquawka
Henry County48,448$73,1984.5%59/sq mi823 sq miCambridge
Iroquois County26,136$64,9954.4%23/sq mi1,117 sq miWatseka
Jackson County52,141$48,2894.8%89/sq mi584 sq miMurphysboro
Jasper County9,144$69,9243.3%18/sq mi495 sq miNewton
Jefferson County36,320$60,5435.0%64/sq mi571 sq miMount Vernon
Jersey County21,091$70,1583.8%57/sq mi370 sq miJerseyville
Jo Daviess County21,756$74,4263.4%36/sq mi601 sq miGalena
Johnson County13,326$63,1604.8%39/sq mi344 sq miVienna
Kane County514,982$97,5434.2%992/sq mi519 sq miGeneva
Kankakee County105,940$68,4514.9%157/sq mi676 sq miKankakee
Kendall County139,976$114,6064.1%437/sq mi320 sq miYorkville
Knox County48,411$57,5695.0%68/sq mi716 sq miGalesburg
Lake County708,760$108,3494.2%1,597/sq mi444 sq miWaukegan
LaSalle County108,309$72,2254.9%95/sq mi1,135 sq miOttawa
Lawrence County14,813$55,4114.7%40/sq mi372 sq miLawrenceville
Lee County33,654$66,5984.3%46/sq mi725 sq miDixon
Livingston County35,320$68,5443.7%34/sq mi1,044 sq miPontiac
Logan County27,590$64,7794.4%45/sq mi618 sq miLincoln
Macon County100,591$61,0335.6%173/sq mi581 sq miDecatur
Macoupin County44,018$70,2564.3%51/sq mi863 sq miCarlinville
Madison County262,752$73,1943.9%367/sq mi716 sq miEdwardsville
Marion County36,673$54,7744.6%64/sq mi573 sq miSalem
Marshall County11,683$70,2464.8%30/sq mi387 sq miLacon
Mason County12,523$62,1464.3%23/sq mi539 sq miHavana
Massac County13,661$58,2024.2%58/sq mi237 sq miMetropolis
McDonough County26,839$50,4874.1%46/sq mi589 sq miMacomb
McHenry County312,800$101,2054.4%518/sq mi603 sq miWoodstock
McLean County170,441$79,6223.8%144/sq mi1,183 sq miBloomington
Menard County11,954$80,9644.0%38/sq mi314 sq miPetersburg
Mercer County15,487$77,0984.2%28/sq mi561 sq miAledo
Monroe County34,957$103,0323.0%91/sq mi385 sq miWaterloo
Montgomery County27,663$60,5994.2%39/sq mi704 sq miHillsboro
Morgan County32,140$64,2684.0%56/sq mi569 sq miJacksonville
Moultrie County14,342$72,9283.3%43/sq mi336 sq miSullivan
Ogle County51,265$78,1094.3%68/sq mi759 sq miOregon
Peoria County177,513$62,8734.9%287/sq mi619 sq miPeoria
Perry County20,503$62,8304.8%46/sq mi442 sq miPinckneyville
Piatt County16,714$81,6113.3%38/sq mi439 sq miMonticello
Pike County14,342$58,7334.2%17/sq mi831 sq miPittsfield
Pope County3,707$58,0935.7%10/sq mi369 sq miGolconda
Pulaski County4,911$50,8635.6%25/sq mi199 sq miMound City
Putnam County5,561$75,4694.3%35/sq mi160 sq miHennepin
Randolph County29,815$70,5263.8%52/sq mi575 sq miChester
Richland County15,488$57,1194.0%43/sq mi360 sq miOlney
Rock Island County141,236$63,4574.5%330/sq mi428 sq miRock Island
Saline County22,873$53,3184.3%60/sq mi380 sq miHarrisburg
Sangamon County193,491$73,0044.3%223/sq mi868 sq miSpringfield
Schuyler County6,733$64,4444.4%15/sq mi437 sq miRushville
Scott County4,710$67,1573.9%19/sq mi251 sq miWinchester
Shelby County20,568$68,6183.6%27/sq mi759 sq miShelbyville
St. Clair County251,018$66,0074.3%382/sq mi658 sq miBelleville
Stark County5,218$69,5234.7%18/sq mi288 sq miToulon
Stephenson County43,105$64,9264.0%76/sq mi564 sq miFreeport
Tazewell County129,541$73,6594.2%200/sq mi646 sq miPekin
Union County16,667$64,4524.2%40/sq mi413 sq miJonesboro
Vermilion County71,652$51,8135.0%80/sq mi898 sq miDanville
Wabash County10,942$64,4664.8%49/sq mi223 sq miMount Carmel
Warren County16,185$64,4934.1%30/sq mi542 sq miMonmouth
Washington County13,536$74,8483.4%24/sq mi563 sq miNashville
Wayne County15,761$56,0714.9%22/sq mi714 sq miFairfield
White County13,401$56,7684.6%27/sq mi495 sq miCarmi
Whiteside County54,498$68,6414.4%80/sq mi684 sq miMorrison
Will County700,728$103,5874.8%838/sq mi836 sq miJoliet
Williamson County66,706$60,7044.0%159/sq mi420 sq miMarion
Winnebago County280,922$65,7955.0%548/sq mi513 sq miRockford
Woodford County38,285$90,1693.5%73/sq mi528 sq miEureka

All 102 counties, sortable by any column — click a heading. A suppressed estimate (coefficient of variation ≥ 0.30) shows a marker, never a guess. County seats are from Wikidata (CC0), each validated to a Census place inside its county; a county with no validated seat is left blank. See the methodology.

Download & print this Illinois map

Map of Illinois's 102 counties — on official U.S. Census boundaries

Free, print-ready maps of Illinois — all 102 counties on official U.S. Census boundaries, no watermark. Public domain (CC0).

  • Full map — counties + major cities: PNG · PDF
  • Blank outline — print & label it yourself: PNG · PDF
  • Counties only — clean labeled reference: PNG · PDF

Illinois maps, coloured by the data

Map of Illinois counties shaded by population — official U.S. Census data
Population Map by County · Census PEP 2023
Map of Illinois counties shaded by median household income — official U.S. Census data
Median Household Income Map by County · Census SAIPE 2023
Map of Illinois counties shaded by unemployment rate — U.S. Bureau of Labor Statistics
Unemployment Rate Map by County · BLS LAUS

Cities in Illinois

Illinois has 1,294 incorporated cities, towns, and villages. The largest is Chicago in Cook County with 2,707,648 residents. Use the search on the map above to find any city and highlight the county it sits in.

ChicagoCook County2,707,648
AuroraKane County179,867
JolietWill County149,785
NapervilleDuPage County149,424
RockfordWinnebago County147,649
ElginKane County114,106
SpringfieldSangamon County113,714
PeoriaPeoria County112,126
WaukeganLake County88,919
ChampaignChampaign County88,822
Cicero (town)Cook County83,223
BloomingtonMcLean County78,703
Schaumburg (village)Cook County76,780
EvanstonCook County76,552
Arlington Heights (village)Cook County76,220
Bolingbrook (village)Will County73,813
DecaturMacon County70,368
Palatine (village)Cook County66,548
Skokie (village)Cook County66,427
Des PlainesCook County59,408
Orland Park (village)Cook County57,961
Oak Lawn (village)Cook County57,098
BerwynCook County55,888
Mount Prospect (village)Cook County55,648
Tinley Park (village)Cook County55,007
WheatonDuPage County53,453
Oak Park (village)Cook County53,315
Normal (town)McLean County52,908
Hoffman Estates (village)Cook County51,186
Downers Grove (village)DuPage County49,867
Glenview (village)Cook County47,682
Plainfield (village)Will County45,705
ElmhurstDuPage County45,538
Lombard (village)DuPage County43,722
Buffalo Grove (village)Lake County42,824
MolineRock Island County42,235
BellevilleSt. Clair County41,722
Romeoville (village)Will County40,996
Bartlett (village)DuPage County40,531
DeKalbDeKalb County40,464
Crystal LakeMcHenry County40,436
Carol Stream (village)DuPage County39,427
Park RidgeCook County39,241
QuincyAdams County39,188
Streamwood (village)Cook County39,055
Wheeling (village)Cook County38,495
UrbanaChampaign County38,447
Carpentersville (village)Kane County37,544
Hanover Park (village)DuPage County36,850
Rock IslandRock Island County36,758

Showing the 50 most populous — and 1,244 more. Search the map above for any Illinois city or village.

A city can span more than one county; each is listed in its primary county — the one its center falls in.

Which Illinois county is the richest, largest, most crowded? The answers

  • Illinois’s highest median household income is in Kendall County ($114,606); the lowest is in Alexander County ($45,550). Census SAIPE 2023
  • Illinois’s most populous county is Cook County (5,087,072); the least populous is Hardin County (3,569) — a 1,425× spread. Census PEP 2023
  • Illinois’s largest county by land area is McLean County (1,183 sq mi); the smallest is Putnam County (160 sq mi). Census TIGER
  • Illinois’s highest population density is in Cook County (5,384/sq mi); the lowest is in Pope County (10/sq mi). Census PEP 2023 · TIGER
  • Illinois’s highest poverty rate is in Alexander County (25.8%); the lowest is in Monroe County (4.9%). Census SAIPE 2023
  • In Illinois, unemployment is highest in Edwards County (9.6%) and lowest in Brown County (2.9%), for May 2026. BLS LAUS
  • Illinois’s highest median age is in Hardin County (55.0); the lowest is in Champaign County (30.9). Census ACS 2019–2023
  • Illinois’s highest share of bachelor’s degrees is in DuPage County (51.4% of adults); the lowest is in Pulaski County (11.9%). Census ACS 2019–2023

Every figure is a current official estimate from the source named — not a crowd-sourced or copied value. Suppressed estimates (coefficient of variation ≥ 0.30) are omitted, never guessed. See the full methodology.

Illinois counties: common questions

How many counties are in Illinois?

Illinois has 102 counties covering 55,514 sq mi and about 12.5M residents. Every one is on the map above and in the table below.

What is the largest county in Illinois?

It depends on the measure. By land area it’s McLean County (1,183 sq mi); by population it’s Cook County (5,087,072 residents).

What county is Chicago in?

Chicago (population 2,707,648) is in Cook County. Use the search on the map to find any Illinois city’s county.

What is the richest county in Illinois?

By median household income, Kendall County is the richest at $114,606; the poorest is Alexander County at $45,550 (Census SAIPE 2023).

What is the most populous county in Illinois?

Cook County, with 5,087,072 residents — about 40.5% of Illinois’s people, and 1,425× the least populous, Hardin County (3,569).

Sources & vintages

  • Population — PEP Vintage 2023 (July 1, 2023) — pep/charv
  • Median household income & poverty — SAIPE 2023
  • Unemployment — BLS LAUS May 2026 (preliminary)
  • Geometry & boundaries — Census TIGERweb
  • Cities & city population — Census TIGERweb Incorporated Places + ACS 5-year 2019–2023

Data current through .