Greene County, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 84th-largest in Illinois
The population of Greene County, Illinois is 11,837 as of the 2023 American Community Survey, making it the 84th-largest county in Illinois. The median household income is $60,976, the median home value is $94,400, and the median age is 43.1.
The population of Greene County has declined 17.8% since 2010 (13,890 → 11,417), a -1.39% annualized rate.
11,837
Population
-1.39%
Annual growth
22
People / sq mi
$60,976
Median Income
$94,400
Median Home Value
Greene County covers 543 sq mi of land at 21.8 people per square mile.
About Greene County, IL
Greene County is a county in Illinois with a population of 11,837. It ranks #84 among counties in Illinois by population. The median age is 43.1, older than the national median. The population is 50.3% male and 49.7% female.
The median household income in Greene County is $60,976, below the US median of $74,580. 9.6% of residents live below the federal poverty level. Home values sit at a median of $94,400, with monthly rent averaging $800. The homeownership rate of 76.8% is higher than the national rate of 64.8%.
Educational attainment in Greene County reflects 16.3% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 7.8% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 29.6 minutes each way.
Greene County Population History (2010-2024)
The county of Greene County had a population of 13,890 in 2010 and 11,417 in 2024, a -17.8% growth over 14 years. The peak was 13,890 in 2010. Average annual growth rate: -1.37%.
11,417
Population (2024)
13,890
Population (2010)
13,890
Peak (2010)
-1.37%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 13,890 |
| 2011 | 13,857 |
| 2012 | 13,657 |
| 2013 | 13,635 |
| 2014 | 13,416 |
| 2015 | 13,345 |
| 2016 | 13,111 |
| 2017 | 13,153 |
| 2018 | 13,051 |
| 2019 | 12,922 |
| 2020 | 11,935 |
| 2021 | 11,848 |
| 2022 | 11,643 |
| 2023 | 11,572 |
| 2024 | 11,417 |
Race & Ethnicity
| White | 96.1% |
| Black or African American | 0.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.7% |
| Two or More Races | 0.0% |
Age & Sex
43.1
Median Age
49.7%
Female
50.3%
Male
20.4%
Age 65+
Age Distribution
Children (under 15): 17.3% · Seniors (65+): 20.4%
Income & Poverty
| Median household income | $60,976$-20,726 vs state |
| Mean household income | $81,696 |
| Per-capita income | $33,174 |
| Poverty rate | 9.6%+1.4% vs state |
| Unemployment rate | 2.4% |
| Employment-to-population | 56.0% |
Top Industries by Employment
The largest employment sector in Greene County is professional & business services, accounting for 23.8% of workers.
How residents commute
0.2%
Drive alone
1.0%
Carpool
77.8%
Public transit
7.8%
Work from home
29.6 min
Avg commute
Housing
$94,400$-156,100 vs state
Median home value
$800
Median rent
76.8%
Homeownership rate
5,801
Total housing units
77.8%
Occupied
22.2%
Vacant
23.2%
Renter-occupied
Social & access
95.3%
With health insurance
91.9%
With broadband internet
12.2%
Foreign-born
8.5%
Veterans (18+)
16.9%
With a disability
98.6%
Speak language other than English at home
Education
90.4%
High School+
16.3%
Bachelor's+
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County rankings
Frequently Asked Questions
Greene County, Illinois has a population of 11,837 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 84th-largest county in Illinois. Population density is 22 people per square mile.
The population of Greene County has declined 17.8% since 2010 (13,890 → 11,417), a -1.39% annualized rate.
The median household income in Greene County, Illinois is $60,976, with mean (average) household income of $81,696 and per-capita income of $33,174. 9.6% of residents live below the federal poverty level.
In Greene County, the largest racial and ethnic groups are White (96.1%), Black or African American (0.7%), Hispanic or Latino (0.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Greene County, Illinois is 43.1 years. Residents are 49.7% female and 50.3% male.
The median home value in Greene County is $94,400 and median monthly rent is $800. 76.8% of occupied housing units are owner-occupied. The county has 5,801 total housing units, 22.2% of which are vacant.
The largest employment sector in Greene County, Illinois is professional, scientific, and management services, employing 23.8% of workers. The unemployment rate is 2.4%.
Chicago is among the largest cities associated with Greene 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.