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Clinton County, IL
13 cities and towns and 11 ZIP codes in Clinton County, Illinois.
Population
36,954
Land area
474sq mi
People per sq mi
78
ZIP codes
11
Cities and towns in Clinton County
Clinton County at a glance
- Clinton County is 66% less dense than Illinois as a whole.
- Households here earn a median of $86,588 a year, 4% more than the Illinois figure of $83,390.
- A typical owner-occupied home is valued at $192,400 (27% below Illinois) and median rent is $912 a month.
- The biggest population centers are Breese (4,301), New Baden (3,463) and Carlyle (2,980).
Local data for Clinton County, IL
Counts from official public data
Housing and community stats
Clinton County, IL, American Community Survey 2020-2024
Median household income
$86,588
Poverty rate
7.4%
Median home value
$192,400
Prices +5.5% in a year
Median rent
$912/mo
Homeownership
80.3%
Bachelor's or higher
25.9%
Median age
41.5
Average commute
25.9 min
Largest reported origins and ancestries: German Americans (16,263), Irish Americans (2,412), French Americans (1,057).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
2.7%
Aug 2026, -0.8 pts in a year
Average annual pay
$53,836
12,725 jobs, 2025
Income per person
$64,744
BEA, 2024
Federal spending
$250M
FY 2026, $6,784 per person
PPP loans
$72.2M
1,699 loans, 9,172 jobs reported
Campaign donations
$228K
Itemized, 2026 cycle
How people get to work
Clinton County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone76.3%
- Carpooled7.6%
- Public transit0.3%
- Walked2.6%
- Bicycle0.1%
- Taxi, ride-hailing, motorcycle or other0.6%
- Worked from home12.6%
Average one-way commute: 25.9 minutes for people who do not work from home.
Environment and hazard risk
Clinton County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: earthquake
Storm events since 1996
395
Most often thunderstorm wind
Flood insurance policies
39
0.2% of homes, county
July high / Jan low
88° / 22°F
45.9 inches of rain a year
Hazards, floods and storm historyCheck a flood zone2 historic places
Health statistics
Share of adults in Clinton County, IL, CDC PLACES estimates
Obesity
40.2%
U.S. 33.3% +6.9 pts
Diabetes
11.3%
U.S. 12.1% -0.8 pts
Smoking
14.0%
U.S. 12.8% +1.2 pts
Uninsured (18-64)
7.5%
U.S. 11.1% -3.6 pts
Cities, towns and ZIP codes in Clinton County
Population shown
Frequently asked questions
- What is the largest city in Clinton County, IL?
- Breese is the largest city or town in Clinton County, with about 4,301 residents.
- How many ZIP codes are in Clinton County?
- Clinton County includes 11 ZIP Code Tabulation Areas, including 62215, 62216, 62218, 62219, 62230.
- What is the population of Clinton County, IL?
- About 36,954 people live in Clinton County, based on American Community Survey 5-year estimates.
- What counties border Clinton County?
- Clinton County borders Madison County, St. Clair County, Marion County, Fayette County, Bond County, Washington County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023