De Witt County, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 70th-largest in Illinois
The population of De Witt County, Illinois is 15,461 as of the 2023 American Community Survey, making it the 70th-largest county in Illinois. The median household income is $64,802, the median home value is $124,200, and the median age is 44.0.
The population of De Witt County has declined 7.7% since 2010 (16,589 → 15,319), a -0.57% annualized rate.
15,461
Population
-0.57%
Annual growth
39
People / sq mi
$64,802
Median Income
$124,200
Median Home Value
De Witt County covers 398 sq mi of land at 38.9 people per square mile.
About De Witt County, IL
De Witt County is a county in Illinois with a population of 15,461. It ranks #70 among counties in Illinois by population. The median age is 44.0, older than the national median. The population is 50.2% male and 49.8% female.
The median household income in De Witt County is $64,802, below the US median of $74,580. 4.8% of residents live below the federal poverty level. Home values sit at a median of $124,200, with monthly rent averaging $857. The homeownership rate of 76.8% is higher than the national rate of 64.8%.
Educational attainment in De Witt County reflects 21.4% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 7.6% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 22.7 minutes each way.
De Witt County Population History (2010-2024)
The county of De Witt County had a population of 16,589 in 2010 and 15,319 in 2024, a -7.7% growth over 14 years. The peak was 16,589 in 2010. Average annual growth rate: -0.57%.
15,319
Population (2024)
16,589
Population (2010)
16,589
Peak (2010)
-0.57%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 16,589 |
| 2011 | 16,549 |
| 2012 | 16,490 |
| 2013 | 16,372 |
| 2014 | 16,216 |
| 2015 | 16,185 |
| 2016 | 16,152 |
| 2017 | 15,910 |
| 2018 | 15,768 |
| 2019 | 15,624 |
| 2020 | 15,464 |
| 2021 | 15,410 |
| 2022 | 15,341 |
| 2023 | 15,331 |
| 2024 | 15,319 |
Race & Ethnicity
| White | 94.5% |
| Black or African American | 1.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Age & Sex
44.0
Median Age
49.8%
Female
50.2%
Male
20.0%
Age 65+
Age Distribution
Children (under 15): 17.6% · Seniors (65+): 20.0%
Income & Poverty
| Median household income | $64,802$-16,900 vs state |
| Mean household income | $83,717 |
| Per-capita income | $36,977 |
| Poverty rate | 4.8%-3.4% vs state |
| Unemployment rate | 3.0% |
| Employment-to-population | 59.0% |
Top Industries by Employment
The largest employment sector in De Witt County is professional & business services, accounting for 21.3% of workers.
How residents commute
0.4%
Drive alone
2.0%
Carpool
84.5%
Public transit
7.6%
Work from home
22.7 min
Avg commute
Housing
$124,200$-126,300 vs state
Median home value
$857
Median rent
76.8%
Homeownership rate
7,312
Total housing units
90.8%
Occupied
9.2%
Vacant
23.2%
Renter-occupied
Social & access
96.2%
With health insurance
92.0%
With broadband internet
14.6%
Foreign-born
9.6%
Veterans (18+)
13.3%
With a disability
97.6%
Speak language other than English at home
Education
92.8%
High School+
21.4%
Bachelor's+
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County rankings
Frequently Asked Questions
De Witt County, Illinois has a population of 15,461 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 70th-largest county in Illinois. Population density is 39 people per square mile.
The population of De Witt County has declined 7.7% since 2010 (16,589 → 15,319), a -0.57% annualized rate.
The median household income in De Witt County, Illinois is $64,802, with mean (average) household income of $83,717 and per-capita income of $36,977. 4.8% of residents live below the federal poverty level.
In De Witt County, the largest racial and ethnic groups are White (94.5%), Hispanic or Latino (1.3%), Black or African American (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in De Witt County, Illinois is 44.0 years. Residents are 49.8% female and 50.2% male.
The median home value in De Witt County is $124,200 and median monthly rent is $857. 76.8% of occupied housing units are owner-occupied. The county has 7,312 total housing units, 9.2% of which are vacant.
The largest employment sector in De Witt County, Illinois is professional, scientific, and management services, employing 21.3% of workers. The unemployment rate is 3.0%.
Chicago is among the largest cities associated with De Witt County, Illinois, with a population of 2,707,648.
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Statewide data for Illinois
Population, race, income, age, and trends across Illinois
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.