Greene County, IL Demographics
Greene County, IL is the 84th most populous of 102 counties in Illinois, with 11,985 residents across 543 square miles. That is about 22 people per square mile.
At the 2020 census
| Population | 11,985 |
|---|---|
| Land area | 543 sq mi |
| Density | 22 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Greene County compares to the US
We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.
Central Location: Greene County, IL
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Greene County, IL — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Greene County, IL
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 9740 | 3,381 | 88.7 | 38 |
| Census Tract 9736 | 3,082 | 219.2 | 14 |
| Census Tract 9739 | 2,315 | 3.1 | 759 |
| Census Tract 9738 | 1,619 | 227.7 | 7 |
| Census Tract 9737 | 1,588 | 4.5 | 355 |
Related places
About this page
This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.
Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.