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
In Greene County, home values do the distinguishing — a median of $94,400. Greene County is a county in Illinois with a population of 11,837.
Median household income is $60,976, below the US median of $78,538. The poverty rate is 9.6%, below the national 12.4%. Home prices sit near the bottom of the range at $94,400, with typical rent around $800.
College attainment is 16.3%, below the national 35.0%. About 7.8% of the workforce is home-based, below the national 14.0%, and the average commute runs about 30 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+
Largest cities in Illinois
Other counties in Illinois
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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.
Greene County, IL Climate
Greene County, IL has an average annual temperature of 11.8°C (53°F) and receives about 934 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.8°C
Avg Temp
934
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -3° / 26° | 40 mm |
| February | 0° / 31° | 44 mm |
| March | 6° / 42° | 82 mm |
| April | 12° / 54° | 95 mm |
| May | 18° / 64° | 111 mm |
| June | 23° / 73° | 93 mm |
| July | 25° / 77° | 89 mm |
| August | 24° / 75° | 82 mm |
| September | 20° / 67° | 83 mm |
| October | 13° / 56° | 68 mm |
| November | 6° / 43° | 80 mm |
| December | 0° / 31° | 67 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 Greene County, IL
The most comfortable months to visit Greene County, IL are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -8°C low). May is usually the wettest month.
Where to stay near Greene County
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Top-rated places to stay near Greene County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.