Madison County, Illinois

County seat: Edwardsville · Population 263,110 (2025) · 716 sq mi

Madison County is the 8th most populous of Illinois's 102 counties, with 263,110 people (2025 estimate). Its county seat is Edwardsville. It is part of the Southwest region, one of the 10 Illinois economic development regions (DCEO). The map shows its 29 cities and towns and the 9 neighboring counties.

Map of Madison County, Illinois with cities, towns and the county boundary
Madison 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) 159 KBPNG image 106 KBIllinois county map

Madison County facts

County seat
Edwardsville
Population (2025 estimate)
263,110 −1.1% since 2020
Land area
716 sq mi 22nd largest of 102
Water area
24 sq mi
Population density
368 per sq mi
Established
1812
Same name
One of 19 Madison Counties in the US
Named after
James Madison President of the United States from 1809 to 1817 (1751–1836)
Largest city
Granite City 26,807
Median household income
$75,793
Cities and towns
29 plus 5 CDPs
ZIP codes
36
Time zone
Central
FIPS code
17119

Cities and towns in Madison County

Madison County has 29 incorporated cities, towns and villages. Populations count the people living inside Madison County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Granite CityCity26,807
Edwardsville (county seat)City26,463
AltonCity25,013
CollinsvilleCity21,162St. Clair County
GodfreyVillage17,620
Glen CarbonVillage13,898
TroyCity11,893
Wood RiverCity10,224
HighlandCity10,042
BethaltoVillage9,202
MaryvilleVillage8,413
Pontoon BeachVillage5,887
East AltonVillage5,621
MadisonCity3,062St. Clair County
South RoxanaVillage1,849
VeniceCity1,450
RoxanaVillage1,395
St. JacobVillage1,371
HartfordVillage1,153
WordenVillage1,066
MarineVillage968
HamelVillage937
LivingstonVillage748
AlhambraVillage613
New DouglasVillage339
GrantforkVillage330
WilliamsonVillage175
PierronVillage49Bond County
Fairmont CityVillage22St. Clair County

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Rosewood Heights4,229
Holiday Shores2,782
Mitchell1,092
Moro524
Prairietown183

ZIP codes in Madison County

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

Population of Madison County, 2020–2025

Madison County shrank by 2,873 people (−1.1%) between April 2020 and July 2025: 3,408 more deaths than births and a net gain of 423 people from migration.

Year (July 1)Population
2020265,746
2021265,157
2022263,823
2023263,404
2024263,317
2025263,110

Neighboring counties

Printable Madison 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.

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Sources

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