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Randolph County, IL
14 cities and towns and 12 ZIP codes in Randolph County, Illinois.
Population
30,058
Land area
575sq mi
People per sq mi
52
ZIP codes
12
Cities and towns in Randolph County
Randolph County at a glance
- Randolph County is 77% less dense than Illinois as a whole.
- Households here earn a median of $68,131 a year, 18% less than the Illinois figure of $83,390.
- A typical owner-occupied home is valued at $135,100 (49% below Illinois) and median rent is $780 a month.
- The biggest population centers are Chester (6,797), Sparta (4,068) and Red Bud (3,782).
Local data for Randolph County, IL
Counts from official public data
Housing and community stats
Randolph County, IL, American Community Survey 2020-2024
Median household income
$68,131
Poverty rate
14.6%
Median home value
$135,100
Prices +10.3% in a year
Median rent
$780/mo
Homeownership
76.6%
Bachelor's or higher
15.2%
Median age
43.7
Average commute
23.1 min
Largest reported origins and ancestries: German Americans (10,734), Irish Americans (3,389), French Americans (1,413).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
3.1%
Sep 2026, -0.8 pts in a year
Average annual pay
$59,704
11,252 jobs, 2025
Income per person
$51,003
BEA, 2024
Federal spending
$218M
FY 2026, $7,233 per person
PPP loans
$64.5M
958 loans, 6,459 jobs reported
Campaign donations
$131K
Itemized, 2026 cycle
How people get to work
Randolph County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone81.4%
- Carpooled9.5%
- Public transit0.0%
- Walked2.4%
- Bicycle0.6%
- Taxi, ride-hailing, motorcycle or other0.8%
- Worked from home5.3%
Average one-way commute: 23.1 minutes for people who do not work from home.
Environment and hazard risk
Randolph County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: earthquake
Storm events since 1996
451
Most often hail
Flood insurance policies
130
1.2% of homes, county
July high / Jan low
89° / 24°F
42.8 inches of rain a year
Hazards, floods and storm historyCheck a flood zone5 historic places
Health statistics
Share of adults in Randolph County, IL, CDC PLACES estimates
Obesity
38.8%
U.S. 33.3% +5.5 pts
Diabetes
12.9%
U.S. 12.1% +0.8 pts
Smoking
16.3%
U.S. 12.8% +3.5 pts
Uninsured (18-64)
9.3%
U.S. 11.1% -1.8 pts
Cities, towns and ZIP codes in Randolph County
Population shown
Frequently asked questions
- What is the largest city in Randolph County, IL?
- Chester is the largest city or town in Randolph County, with about 6,797 residents.
- How many ZIP codes are in Randolph County?
- Randolph County includes 12 ZIP Code Tabulation Areas, including 62217, 62233, 62241, 62242, 62261.
- What is the population of Randolph County, IL?
- About 30,058 people live in Randolph County, based on American Community Survey 5-year estimates.
- What counties border Randolph County?
- Randolph County borders St. Clair County, Jackson County, Monroe County, Perry County, Perry County, MO, Ste. Genevieve County, MO, Washington County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023