What is the largest city in Madison County, IL?

Granite City is the largest city or town in Madison County, with about 26,549 residents.

How many ZIP codes are in Madison County?

Madison County includes 28 ZIP Code Tabulation Areas, including 62001, 62002, 62010, 62018, 62021.

What is the population of Madison County, IL?

About 264,238 people live in Madison County, based on American Community Survey 5-year estimates.

What counties border Madison County?

Madison County borders St. Louis County, MO, St. Charles County, MO, St. Louis city, MO, St. Clair County, Macoupin County, Clinton County, Montgomery County, Jersey County, Bond County.

Madison County, IL: Cities, ZIP Codes & Local Data

Population

264,238

Land area

716sq mi

People per sq mi

369

ZIP codes

28

Madison County at a glance

Madison County is 61% denser than Illinois as a whole.
It is the 8th most populous of 102 counties in Illinois.
Households here earn a median of $75,793 a year, 9% less than the Illinois figure of $83,390.
A typical owner-occupied home is valued at $173,000 (34% below Illinois) and median rent is $1,024 a month.
The biggest population centers are Granite City (26,549), Edwardsville (26,474) and Alton (25,279).

Local data for Madison County, IL

Counts from official public data

Housing and community stats

Madison County, IL, American Community Survey 2020-2024

Full profile

Median household income

$75,793

Poverty rate

11.1%

Median home value

$173,000

Prices +6.7% in a year

Median rent

$1,024/mo

Homeownership

74.2%

Bachelor's or higher

31.0%

Median age

40.2

Average commute

24.9 min

Largest reported origins and ancestries: German Americans (70,244), Irish Americans (35,256), Italian Americans (12,504).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.4%

Sep 2026, -0.7 pts in a year

Average annual pay

$59,911

107,517 jobs, 2025

Income per person

$62,684

BEA, 2024

Federal spending

$1.7B

FY 2026, $6,581 per person

PPP loans

$493M

7,737 loans, 58,277 jobs reported

Campaign donations

$1.1M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Madison County, IL, workers 16 and older. American Community Survey 5-year estimates

Drove alone78.1%
Carpooled6.6%
Public transit0.6%
Walked1.1%
Bicycle0.1%
Taxi, ride-hailing, motorcycle or other0.8%
Worked from home12.7%

Average one-way commute: 24.9 minutes for people who do not work from home.

Environment and hazard risk

Madison County, IL, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Moderate

Top: heat wave

Storm events since 1996

854

Most often thunderstorm wind

Flood insurance policies

824

0.8% of homes, county

July high / Jan low

87° / 22°F

41.9 inches of rain a year

Hazards, floods and storm history Check a flood zone 29 historic places

Health statistics

Share of adults in Madison County, IL, CDC PLACES estimates

All 40 measures

Obesity

38.7%

U.S. 33.3% +5.4 pts

Diabetes

11.2%

U.S. 12.1% -0.9 pts

Smoking

13.3%

U.S. 12.8% +0.5 pts

Uninsured (18-64)

7.3%

U.S. 11.1% -3.8 pts

Cities, towns and ZIP codes in Madison County

Population shown

Frequently asked questions

What is the largest city in Madison County, IL?: Granite City is the largest city or town in Madison County, with about 26,549 residents.
How many ZIP codes are in Madison County?: Madison County includes 28 ZIP Code Tabulation Areas, including 62001, 62002, 62010, 62018, 62021.
What is the population of Madison County, IL?: About 264,238 people live in Madison County, based on American Community Survey 5-year estimates.
What counties border Madison County?: Madison County borders St. Louis County, MO, St. Charles County, MO, St. Louis city, MO, St. Clair County, Macoupin County, Clinton County, Montgomery County, Jersey County, Bond County.