Carroll County, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 68th-largest in Illinois
The population of Carroll County, Illinois is 15,621 as of the 2023 American Community Survey, making it the 68th-largest county in Illinois. The median household income is $60,871, the median home value is $113,500, and the median age is 44.9.
The population of Carroll County has grown 0.3% since 2010 (15,395 → 15,444), a +0.02% annualized rate.
15,621
Population
+0.02%
Annual growth
35
People / sq mi
$60,871
Median Income
$113,500
Median Home Value
Carroll County covers 445 sq mi of land at 35.1 people per square mile.
About Carroll County, IL
In Carroll County, home values do the distinguishing — a median of $113,500. With 15,621 residents, Carroll County is a county in Illinois.
Median household income is $60,871, below the US median of $78,538. Poverty runs at 8.2%, below the national 12.4%. Housing is relatively affordable, with a median home value of $113,500, with typical rent around $784.
Roughly 18.2% of adults have a bachelor’s, below the national 35.0%. Around 6.3% of workers work from home, below the national 14.0%, and the average commute runs about 22 minutes each way.
Carroll County Population History (2010-2024)
The county of Carroll County had a population of 15,395 in 2010 and 15,444 in 2024, a 0.3% growth over 14 years. The peak was 15,712 in 2021. Average annual growth rate: 0.06%.
15,444
Population (2024)
15,395
Population (2010)
15,712
Peak (2021)
0.06%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 15,395 |
| 2011 | 15,229 |
| 2012 | 15,121 |
| 2013 | 14,969 |
| 2014 | 14,783 |
| 2015 | 14,638 |
| 2016 | 14,601 |
| 2017 | 14,473 |
| 2018 | 14,337 |
| 2019 | 14,338 |
| 2020 | 15,678 |
| 2021 | 15,712 |
| 2022 | 15,553 |
| 2023 | 15,492 |
| 2024 | 15,444 |
Race & Ethnicity
| White | 90.8% |
| Black or African American | 3.9% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.9% |
| Two or More Races | 0.0% |
Age & Sex
44.9
Median Age
45.6%
Female
54.4%
Male
24.0%
Age 65+
Age Distribution
Children (under 15): 14.7% · Seniors (65+): 24.0%
Income & Poverty
| Median household income | $60,871$-20,831 vs state |
| Mean household income | $79,017 |
| Per-capita income | $32,921 |
| Poverty rate | 8.2% |
| Unemployment rate | 2.3% |
| Employment-to-population | 50.5% |
Top Industries by Employment
The largest employment sector in Carroll County is manufacturing, accounting for 22.1% of workers.
How residents commute
0.9%
Drive alone
3.6%
Carpool
80.9%
Public transit
6.3%
Work from home
22.2 min
Avg commute
Housing
$113,500$-137,000 vs state
Median home value
$784
Median rent
77.8%
Homeownership rate
8,190
Total housing units
79.1%
Occupied
20.9%
Vacant
22.2%
Renter-occupied
Social & access
93.2%
With health insurance
91.5%
With broadband internet
31.7%
Foreign-born
9.4%
Veterans (18+)
15.9%
With a disability
94.8%
Speak language other than English at home
Education
87.7%
High School+
18.2%
Bachelor's+
Largest cities in Illinois
Other counties in Illinois
Part of Illinois
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County rankings
Frequently Asked Questions
Carroll County, Illinois has a population of 15,621 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 68th-largest county in Illinois. Population density is 35 people per square mile.
The population of Carroll County has grown 0.3% since 2010 (15,395 → 15,444), a +0.02% annualized rate.
The median household income in Carroll County, Illinois is $60,871, with mean (average) household income of $79,017 and per-capita income of $32,921. 8.2% of residents live below the federal poverty level.
In Carroll County, the largest racial and ethnic groups are White (90.8%), Black or African American (3.9%), Hispanic or Latino (0.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Carroll County, Illinois is 44.9 years. Residents are 45.6% female and 54.4% male.
The median home value in Carroll County is $113,500 and median monthly rent is $784. 77.8% of occupied housing units are owner-occupied. The county has 8,190 total housing units, 20.9% of which are vacant.
The largest employment sector in Carroll County, Illinois is manufacturing, employing 22.1% of workers. The unemployment rate is 2.3%.
Chicago is among the largest cities associated with Carroll County, Illinois, with a population of 2,707,648.
Carroll County, IL Climate
Carroll County, IL has an average annual temperature of 8.5°C (47°F) and receives about 953 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
8.5°C
Avg Temp
953
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -8° / 18° | 36 mm |
| February | -5° / 23° | 36 mm |
| March | 2° / 35° | 66 mm |
| April | 9° / 48° | 93 mm |
| May | 15° / 60° | 112 mm |
| June | 20° / 69° | 118 mm |
| July | 22° / 72° | 94 mm |
| August | 21° / 70° | 114 mm |
| September | 17° / 62° | 93 mm |
| October | 10° / 51° | 70 mm |
| November | 3° / 37° | 70 mm |
| December | -4° / 24° | 51 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Carroll County, IL
The most comfortable months to visit Carroll County, IL are typically August, July and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -13°C low). June is usually the wettest month.
Where to stay near Carroll County
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Top-rated places to stay near Carroll County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.