Checked
Marion County, IL
14 cities and towns and 9 ZIP codes in Marion County, Illinois.
Population
37,000
Land area
573sq mi
People per sq mi
65
ZIP codes
9
Cities and towns in Marion County
Marion County at a glance
- Marion County is 72% less dense than Illinois as a whole.
- The median household income is $61,240, 27% below the Illinois median of $83,390.
- A typical owner-occupied home is valued at $103,000 (61% below Illinois) and median rent is $794 a month.
- Its largest cities are Centralia (11,856), Salem (7,236) and Central City (1,081).
Local data for Marion County, IL
Counts from official public data
Housing and community stats
Marion County, IL, American Community Survey 2020-2024
Median household income
$61,240
Poverty rate
15.4%
Median home value
$103,000
Prices +6.2% in a year
Median rent
$794/mo
Homeownership
74.7%
Bachelor's or higher
16.8%
Median age
41.5
Average commute
21.1 min
Largest reported origins and ancestries: German Americans (8,938), Irish Americans (4,552), Polish Americans (849).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
4.2%
Sep 2026, -0.8 pts in a year
Average annual pay
$51,566
12,335 jobs, 2025
Income per person
$56,066
BEA, 2024
Federal spending
$258M
FY 2026, $6,847 per person
PPP loans
$38.8M
961 loans, 4,579 jobs reported
Campaign donations
$27.3K
Itemized, 2026 cycle
How people get to work
Marion County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone82.9%
- Carpooled9.8%
- Public transit0.2%
- Walked1.2%
- Bicycle0.4%
- Taxi, ride-hailing, motorcycle or other0.6%
- Worked from home4.8%
Average one-way commute: 21.1 minutes for people who do not work from home.
Environment and hazard risk
Marion County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: earthquake
Storm events since 1996
427
Most often thunderstorm wind
Flood insurance policies
18
0.1% of homes, county
July high / Jan low
88° / 21°F
45.9 inches of rain a year
Hazards, floods and storm historyCheck a flood zone6 historic places
Health statistics
Share of adults in Marion County, IL, CDC PLACES estimates
Obesity
39.5%
U.S. 33.3% +6.2 pts
Diabetes
13.3%
U.S. 12.1% +1.2 pts
Smoking
17.0%
U.S. 12.8% +4.2 pts
Uninsured (18-64)
8.3%
U.S. 11.1% -2.8 pts
Cities, towns and ZIP codes in Marion County
Population shown
Frequently asked questions
- What is the largest city in Marion County, IL?
- Centralia is the largest city or town in Marion County, with about 11,856 residents.
- How many ZIP codes are in Marion County?
- Marion County includes 9 ZIP Code Tabulation Areas, including 62807, 62849, 62853, 62854, 62870.
- What is the population of Marion County, IL?
- About 37,000 people live in Marion County, based on American Community Survey 5-year estimates.
- What counties border Marion County?
- Marion County borders Clinton County, Jefferson County, Fayette County, Wayne County, Washington County, Clay County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023