State 17 · IL

Illinois county map

Illinois has 102 counties. McLean County is the largest by land at 1,183 square miles, and Cook County is the most populous with 5,182,617 residents.

Population 2024
12,710,158
#6 of 51
Land area
55,513 sq mi
#24 of 51
Density
229.0 / sq mi
#13 of 51
Counties
102
Capital: Springfield
N
Springfield 39.78° N, 89.65° W

Map of all 102 counties in Illinois

Every county is labeled on Census 2024 boundaries. Download it as a PDF to print, a PNG, or an editable SVG. For blank, colored or city versions, see the printable Illinois map sheets.

AdamsAlexanderBondBooneBrownBureauCalhounCarrollCassChampaignChristianClarkClayClintonColesCookCrawfordCumberlandDeKalbDe WittDouglasDuPageEdgarEdwardsEffinghamFayetteFordFranklinFultonGallatinGreeneGrundyHamiltonHancockHardinHendersonHenryIroquoisJacksonJasperJeffersonJerseyJo DaviessJohnsonKaneKankakeeKendallKnoxLakeLaSalleLawrenceLeeLivingstonLoganMcDonoughMcHenryMcLeanMaconMacoupinMadisonMarionMarshallMasonMassacMenardMercerMonroeMontgomeryMorganMoultrieOglePeoriaPerryPiattPikePopePulaskiPutnamRandolphRichlandRock IslandSt. ClairSalineSangamonSchuylerScottShelbyStarkStephensonTazewellUnionVermilionWabashWarrenWashingtonWayneWhiteWhitesideWillWilliamsonWinnebagoWoodfordIllinois county map. Online Map Tools (onlinemaptools.com), Census 2024 boundaries, free to reuse with credit.
102 units labeled. The orange dot marks the capital.

Illinois population and land area

Illinois had 12,710,158 residents in the Census Vintage 2024 estimates, the sum of its counties. That ranks 6th of the 50 states and DC. Its 55,513 square miles of land rank 24th. Illinois averages 229.0 people per square mile of land, 2.4 times the national figure of 96.3. By density it ranks 13th.

Population, 2024
12,710,1586th of 51
Land area
55,513 sq mi24th of 51
Density
229.0 per sq mi13th of 51
Number of counties
102
Capital
Springfield39.781° N, 89.650° W
State FIPS code
17

Illinois counties by population, density and income

Each shape is shaded by quintile, darker for higher values. Switch the measure above the map. Select a shape to open that county's page. The pin marks the capital, Springfield.

Piatt County: 38Hamilton County: 18Williamson County: 160Edgar County: 26Macoupin County: 51Marshall County: 30Putnam County: 35Richland County: 43Washington County: 24Lee County: 46Douglas County: 48Cook County: 5,485Effingham County: 72Edwards County: 27Cass County: 34Clay County: 27Knox County: 68LaSalle County: 95Cumberland County: 30Warren County: 30Moultrie County: 43Menard County: 38Fayette County: 30Boone County: 190Lawrence County: 40Marion County: 64Champaign County: 213Clark County: 30Ford County: 28Wayne County: 22Logan County: 45Grundy County: 129Jasper County: 18Crawford County: 41McDonough County: 45Clinton County: 78Perry County: 46Montgomery County: 39Henry County: 59Livingston County: 34Scott County: 19Alexander County: 20Bureau County: 37Brown County: 21Mason County: 23Calhoun County: 17Greene County: 21Coles County: 91Kendall County: 447Lake County: 1,620Mercer County: 27St. Clair County: 382Wabash County: 49Bond County: 44DuPage County: 2,858Gallatin County: 15Stephenson County: 76McHenry County: 524White County: 27Saline County: 60Christian County: 47Sangamon County: 224Massac County: 57Macon County: 174Johnson County: 39Jo Daviess County: 36Peoria County: 290DeKalb County: 161Pope County: 10De Witt County: 39Schuyler County: 15Fulton County: 38Ogle County: 68Jersey County: 57Iroquois County: 23Kankakee County: 157Rock Island County: 334Pulaski County: 24Kane County: 1,003Union County: 41Whiteside County: 80Woodford County: 73Carroll County: 35Adams County: 75Hardin County: 20Madison County: 368Hancock County: 21Monroe County: 91Tazewell County: 201Jackson County: 91Vermilion County: 79Randolph County: 52McLean County: 145Morgan County: 57Shelby County: 27Will County: 848Winnebago County: 553Jefferson County: 63Stark County: 18Henderson County: 16Pike County: 17Franklin County: 91
Density
  1. < 26
  2. 26+
  3. 38+
  4. 57+
  5. 129+
no data

Largest county in Illinois by land area

McLean County ranks first at 1,183 square miles and Putnam County last at 160 square miles. The top value is 7.4 times the bottom one.

  1. 01McLean County1,183
  2. 02LaSalle County1,135
  3. 03Iroquois County1,117
  4. 04Livingston County1,044
  5. 05Champaign County996
  6. 06Cook County945
  7. 07Vermilion County898
  8. 08Bureau County869
  9. 09Sangamon County868
  10. 10Fulton County866

Most populous county in Illinois

Cook County ranks first at 5,182,617 residents and Hardin County last at 3,550 residents. The gap is more than a hundredfold.

  1. 01Cook County5,182,617
  2. 02DuPage County937,142
  3. 03Lake County718,604
  4. 04Will County708,583
  5. 05Kane County520,997
  6. 06McHenry County315,959
  7. 07Winnebago County283,790
  8. 08Madison County263,017
  9. 09St. Clair County251,149
  10. 10Champaign County212,374

Least populous county in Illinois

The smallest populations, fewest first. Estimates for small counties carry more uncertainty than those for large ones.

  1. 01Hardin County3,550
  2. 02Pope County3,703
  3. 03Calhoun County4,224
  4. 04Alexander County4,594
  5. 05Gallatin County4,690
Log scale, so small counties stay visible next to the largest.

Most densely populated county in Illinois

Cook County ranks first at 5,484.7 people per square mile and Pope County last at 10.0 people per square mile. The gap is more than a hundredfold.

  1. 01Cook County5,484.7
  2. 02DuPage County2,858.4
  3. 03Lake County1,619.6
  4. 04Kane County1,003.3
  5. 05Will County847.7
  6. 06Winnebago County553.1
  7. 07McHenry County523.6
  8. 08Kendall County447.1
  9. 09St. Clair County381.8
  10. 10Madison County367.6
People per square mile of land, log scale.

Highest median household income in Illinois

Kendall County ranks first at $114,606 and Alexander County last at $45,550. The top value is 2.5 times the bottom one.

  1. 01Kendall County$114,606
  2. 02Lake County$108,349
  3. 03DuPage County$107,032
  4. 04Will County$103,587
  5. 05Monroe County$103,032
  6. 06McHenry County$101,205
  7. 07Kane County$97,543
  8. 08Grundy County$91,254
  9. 09Woodford County$90,169
  10. 10Clinton County$88,977

Towns and cities in Illinois

The Census Vintage 2024 subcounty estimates list 651 incorporated places in Illinois with 1,000 or more residents, holding 10,842,882 people together, or 85% of the state total. 330 of them have 5,000 or more. The northernmost is Warren at 42.495° N and the southernmost is Cairo at 37.006° N. Among places of 5,000+, Wonder Lake grew fastest from July 2020 to July 2024, by 33.4%.

  1. 01Chicago2,721,308
  2. 02Aurora180,710
  3. 03Naperville153,124
  4. 04Joliet151,837
  5. 05Rockford147,486
  6. 06Elgin114,701
  7. 07Springfield112,949
  8. 08Peoria111,696
  9. 09Champaign91,961
  10. 10Waukegan88,570
  11. 11Cicero82,090
  12. 12Bloomington79,232
Largest incorporated places, Vintage 2024 estimates.

Springfield, the capital

15.9% of Illinois's place population, 1,719,567 of 10,842,882 people, lives in places within 100 miles of Springfield. That ranks 47th of 51 for how central the capital is.

See all states in the capital radius ranking and the most remote towns ranking. Sunrise and sunset times for Springfield, month by month, are on the Springfield daylight page.

States bordering Illinois

Illinois borders 5 states or districts. The nearest neighboring capital is Jefferson City, 159 miles WSW of Springfield in a straight line.

UTM zones in Illinois

The internal points of Illinois's counties fall in UTM zones 15, 16. Zones are 6 degrees of longitude wide, numbered from 180° W: zone = floor((longitude + 180) / 6) + 1. Because Illinois spans 2 zones, no single UTM zone covers the whole state.

All 102 counties in Illinois

Sort by any column. The small orange number marks the top 3 in the state by population.

FIPS
17031Cook County5,182,617#19455,484.7$80,547
17043DuPage County937,142#23282,858.4$107,032
17097Lake County718,604#34441,619.6$108,349
17197Will County708,583836847.7$103,587
17089Kane County520,9975191,003.3$97,543
17111McHenry County315,959603523.6$101,205
17201Winnebago County283,790513553.1$65,795
17119Madison County263,017716367.6$73,194
17163St. Clair County251,149658381.8$66,007
17019Champaign County212,374996213.2$62,169
17167Sangamon County194,345868223.8$73,004
17143Peoria County179,630619290.3$62,873
17113McLean County172,0691,183145.4$79,622
17093Kendall County143,171320447.1$114,606
17161Rock Island County142,731428333.9$63,457
17179Tazewell County129,821646200.8$73,659
17099LaSalle County108,3901,13595.5$72,225
17091Kankakee County106,410676157.3$68,451
17037DeKalb County101,335631160.5$69,439
17115Macon County100,737581173.5$61,033
17183Vermilion County71,10689879.2$51,813
17199Williamson County67,064420159.6$60,704
17001Adams County64,10985575.0$63,424
17195Whiteside County54,65768479.9$68,641
17063Grundy County53,835418128.8$91,254
17007Boone County53,313281189.9$83,129
17077Jackson County53,19958491.2$48,289
17141Ogle County51,34575967.7$78,109
17095Knox County48,71671668.0$57,569
17073Henry County48,17782358.5$73,198
17029Coles County46,42350891.3$57,728
17117Macoupin County43,89586350.9$70,256
17177Stephenson County43,08856476.4$64,926
17203Woodford County38,29052872.6$90,169
17027Clinton County37,08747478.3$88,977
17055Franklin County37,03340990.6$52,533
17121Marion County36,43757363.6$54,774
17081Jefferson County36,10757163.2$60,543
17105Livingston County35,3751,04433.9$68,544
17133Monroe County34,96938590.8$103,032
17049Effingham County34,60247972.3$72,158
17103Lee County33,54472546.3$66,598
17021Christian County33,24770946.9$72,650
17137Morgan County32,61856957.3$64,268
17057Fulton County32,51086637.6$62,914
17011Bureau County32,48686937.4$66,854
17157Randolph County29,90357552.0$70,526
17135Montgomery County27,61570439.2$60,599
17107Logan County27,51861844.5$64,779
17109McDonough County26,66258945.2$50,487
17075Iroquois County26,0671,11723.3$64,995
17165Saline County22,82638060.1$53,318
17085Jo Daviess County21,52860135.8$74,426
17051Fayette County21,15771629.5$61,952
17083Jersey County21,15037057.2$70,158
17173Shelby County20,54275927.1$68,618
17145Perry County20,27244245.9$62,830
17041Douglas County19,82441747.6$82,895
17033Crawford County18,38844441.4$64,168
17067Hancock County17,00879421.4$63,408
17181Union County16,88641340.8$64,452
17147Piatt County16,62843937.9$81,611
17005Bond County16,57638043.6$66,162
17045Edgar County16,39862326.3$59,330
17187Warren County16,21754229.9$64,493
17191Wayne County15,92871422.3$56,071
17015Carroll County15,44444534.7$61,982
17159Richland County15,36236042.7$57,119
17039De Witt County15,31939838.5$74,553
17131Mercer County15,29256127.2$77,098
17023Clark County15,07650130.1$66,923
17101Lawrence County14,80137239.8$55,411
17139Moultrie County14,36533642.8$72,928
17149Pike County14,25883117.2$58,733
17127Massac County13,62723757.5$58,202
17189Washington County13,53556324.1$74,848
17053Ford County13,45148627.7$71,110
17193White County13,39549527.1$56,768
17087Johnson County13,32034438.8$63,160
17025Clay County12,82146827.4$54,837
17017Cass County12,71337633.8$64,413
17125Mason County12,54353923.3$62,146
17129Menard County11,96331438.1$80,964
17123Marshall County11,55238729.9$70,246
17061Greene County11,41754321.0$59,146
17185Wabash County10,97922349.2$64,466
17035Cumberland County10,30534629.8$71,741
17079Jasper County9,09249518.4$69,924
17065Hamilton County7,81843518.0$65,472
17169Schuyler County6,75043715.4$64,444
17009Brown County6,30730620.6$76,076
17071Henderson County6,04837916.0$62,610
17047Edwards County5,98422226.9$59,867
17155Putnam County5,63316035.2$75,469
17175Stark County5,27228818.3$69,523
17171Scott County4,88025119.5$67,157
17153Pulaski County4,87919924.5$50,863
17059Gallatin County4,69032314.5$56,852
17003Alexander County4,59423519.5$45,550
17013Calhoun County4,22425416.6$72,574
17151Pope County3,70336910.0$58,093
17069Hardin County3,55017720.0$51,216

Download all 102 counties as CSV

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 Gazetteer, places
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.