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
The poverty rate is what most separates De Witt County from the typical county: 4.8% of residents live below the federal poverty line, against 12.4% nationally. De Witt County is a county in Illinois with a population of 15,461.
Median household income is $64,802, below the US median of $78,538. Poverty is relatively low for US counties at 4.8%, below the national 12.4%. Property is affordable here, the median home worth $124,200, with typical rent around $857.
21.4% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Remote work is below the national 14.0% at 7.6%, and the average commute runs about 23 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+
Largest cities in Illinois
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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.