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Carroll County, IL
8 cities and towns and 7 ZIP codes in Carroll County, Illinois.
Population
15,576
Land area
445sq mi
People per sq mi
35
ZIP codes
7
Cities and towns in Carroll County
Carroll County at a glance
- Carroll County is 85% less dense than Illinois as a whole.
- The median household income is $60,758, 27% below the Illinois median of $83,390.
- A typical owner-occupied home is valued at $114,500 (57% below Illinois) and median rent is $818 a month.
- Its largest cities are Savanna (2,816), Thomson (1,757) and Lanark (1,541).
Local data for Carroll County, IL
Counts from official public data
Housing and community stats
Carroll County, IL, American Community Survey 2020-2024
Median household income
$60,758
Poverty rate
14.2%
Median home value
$114,500
Prices +3.4% in a year
Median rent
$818/mo
Homeownership
77.2%
Bachelor's or higher
17.8%
Median age
45.4
Average commute
24.6 min
Largest reported origins and ancestries: German Americans (4,781), Irish Americans (2,003), Dutch Americans (645).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
3.4%
Sep 2026, -1.0 pts in a year
Average annual pay
$51,869
4,081 jobs, 2025
Income per person
$54,171
BEA, 2024
Federal spending
$121M
FY 2026, $7,688 per person
PPP loans
$31.5M
1,024 loans, 4,197 jobs reported
Campaign donations
$73.9K
Itemized, 2026 cycle
How people get to work
Carroll County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone79.2%
- Carpooled9.5%
- Public transit0.9%
- Walked2.7%
- Bicycle0.3%
- Taxi, ride-hailing, motorcycle or other0.6%
- Worked from home6.8%
Average one-way commute: 24.6 minutes for people who do not work from home.
Environment and hazard risk
Carroll County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Very Low
Top: drought
Storm events since 1996
545
Most often thunderstorm wind
Flood insurance policies
15
0.1% of homes, county
July high / Jan low
85° / 11°F
40.3 inches of rain a year
Hazards, floods and storm historyCheck a flood zone7 historic places
Health statistics
Share of adults in Carroll County, IL, CDC PLACES estimates
Obesity
38.8%
U.S. 33.3% +5.5 pts
Diabetes
13.3%
U.S. 12.1% +1.2 pts
Smoking
15.3%
U.S. 12.8% +2.5 pts
Uninsured (18-64)
9.1%
U.S. 11.1% -2.0 pts
Cities, towns and ZIP codes in Carroll County
Population shown
Frequently asked questions
- What is the largest city in Carroll County, IL?
- Savanna is the largest city or town in Carroll County, with about 2,816 residents.
- How many ZIP codes are in Carroll County?
- Carroll County includes 7 ZIP Code Tabulation Areas, including 61014, 61046, 61051, 61053, 61074.
- What is the population of Carroll County, IL?
- About 15,576 people live in Carroll County, based on American Community Survey 5-year estimates.
- What counties border Carroll County?
- Carroll County borders Whiteside County, Ogle County, Clinton County, IA, Stephenson County, Jo Daviess County, Jackson County, IA.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023