Cook County, Illinois

County seat: Chicago · Population 5.2 million (2025) · 945 sq mi

Cook County is the most populous of Illinois's 102 counties, with 5,194,625 people (2025 estimate). Its county seat is Chicago. It is part of the Northeast region, one of the 10 Illinois economic development regions (DCEO). The map shows its 137 cities and towns and the 8 neighboring counties.

Map of Cook County, Illinois with cities, towns and the county boundary
Cook County, Illinois with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 351 KBPNG image 236 KBIllinois county map

Cook County facts

County seat
Chicago
Population (2025 estimate)
5,194,625 −1.6% since 2020
Land area
945 sq mi 6th largest of 102
Water area
690 sq mi
Population density
5,497 per sq mi
Established
1831
Same name
One of 3 Cook Counties in the US
Named after
Daniel Pope Cook American politician (1794-1827)
Largest city
Chicago 2,731,585 in the county
Median household income
$83,498
Cities and towns
137
ZIP codes
178
Time zone
Central
FIPS code
17031

Cities and towns in Cook County

Cook County has 137 incorporated cities, towns and villages. Populations count the people living inside Cook County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Chicago (county seat)City2,731,585DuPage County
CiceroTown81,858
SchaumburgVillage77,249DuPage County
EvanstonCity76,380
Arlington HeightsVillage76,216
SkokieVillage66,544
PalatineVillage65,842
Des PlainesCity58,772
Orland ParkVillage57,593Will County
Oak LawnVillage56,450
Mount ProspectVillage55,395
BerwynCity55,001
Oak ParkVillage52,823
Hoffman EstatesVillage50,858
GlenviewVillage47,711
Tinley ParkVillage47,446Will County
Park RidgeCity38,463
WheelingVillage38,391Lake County
StreamwoodVillage38,277
Calumet CityCity34,798
NorthbrookVillage34,744
Elk Grove VillageVillage31,885DuPage County
NilesVillage30,443
BurbankCity28,578
LansingVillage28,068
WilmetteVillage27,459
Oak ForestCity26,792
Chicago HeightsCity26,508
ElginCity24,655Kane County
Morton GroveVillage24,582
Melrose ParkVillage23,936
Rolling MeadowsCity23,690
Elmwood ParkVillage23,675
MaywoodVillage23,330
Blue IslandCity21,805
South HollandVillage20,749
DoltonVillage20,671
HarveyCity19,849
Hanover ParkVillage19,406DuPage County
Evergreen ParkVillage19,283
BrookfieldVillage18,879
HomewoodVillage18,773
MattesonVillage18,543
LemontVillage18,505DuPage and Will counties
AlsipVillage18,483
BellwoodVillage18,116
Franklin ParkVillage18,045
Palos HillsCity18,028
Park ForestVillage17,932Will County
BartlettVillage16,962DuPage and Kane counties
BridgeviewVillage16,521
WestchesterVillage16,300
Country Club HillsCity16,215
La GrangeVillage15,935
Prospect HeightsCity15,552
NorridgeVillage14,808
Hickory HillsCity14,101
Chicago RidgeVillage14,036
MidlothianVillage13,841
Forest ParkVillage13,829
Western SpringsVillage13,588
Buffalo GroveVillage13,480Lake County
La Grange ParkVillage13,453
LincolnwoodVillage13,039
Hazel CrestVillage13,024
WinnetkaVillage12,518
Richton ParkVillage12,483
NorthlakeCity12,462
JusticeVillage12,285
Palos HeightsCity12,084
River ForestVillage11,393
Schiller ParkVillage11,317
MarkhamCity11,274
SummitVillage10,753
WorthVillage10,696
CrestwoodVillage10,529
LyonsVillage10,433
River GroveVillage10,409
RiverdaleVillage10,280
Sauk VillageVillage9,624
FlossmoorVillage9,358
LynwoodVillage9,297
RiversideVillage8,939
Harwood HeightsVillage8,761
GlencoeVillage8,724
GlenwoodVillage8,416
HillsideVillage8,140
BroadviewVillage7,871
InvernessVillage7,418
North RiversideVillage7,161
StickneyVillage6,897
Calumet ParkVillage6,772
Orland HillsVillage6,663
CountrysideCity6,260
Willow SpringsVillage5,788
BarringtonVillage5,740Lake County
NorthfieldVillage5,632
PosenVillage5,405
BerkeleyVillage5,141
South BarringtonVillage5,071
Palos ParkVillage4,805
Olympia FieldsVillage4,593
RobbinsVillage4,588
Stone ParkVillage4,477
Burr RidgeVillage4,315DuPage County
HometownCity4,191
StegerVillage3,984Will County
Indian Head ParkVillage3,961
BurnhamVillage3,919
South Chicago HeightsVillage3,884
RoselleVillage3,872DuPage County
RosemontVillage3,815
DixmoorVillage2,951
KenilworthVillage2,437
HinsdaleVillage2,360DuPage County
ThorntonVillage2,299
Barrington HillsVillage2,114Kane, Lake and McHenry counties
Merrionette ParkVillage1,915
Ford HeightsVillage1,751
PhoenixVillage1,646
HodgkinsVillage1,480
East Hazel CrestVillage1,250
Forest ViewVillage763
Bedford ParkVillage589
GolfVillage509
DeerfieldVillage485Lake County
University ParkVillage309Will County
McCookVillage240
Deer ParkVillage20Lake County
Oak BrookVillage12DuPage County
ElmhurstCity9DuPage County
BensenvilleVillage0DuPage County
CreteVillage0Will County
East DundeeVillage0Kane County
FrankfortVillage0Will County
Homer GlenVillage0Will County
WoodridgeVillage0DuPage and Will counties

ZIP codes in Cook County

178 ZIP codes reach into Cook County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Cook County, 2020–2025

Cook County shrank by 84,385 people (−1.6%) between April 2020 and July 2025: 36,980 more births than deaths and a net loss of 121,088 people from migration.

Year (July 1)Population
20205,263,651
20215,186,249
20225,127,866
20235,142,853
20245,188,791
20255,194,625

Neighboring counties

Printable Cook County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

Paste this code to embed the map on your site:

Sources

Back to the Illinois county map with all 102 counties. Found an error? Tell us.