Union County, IL Demographics
Union County, IL is the 61st most populous of 102 counties in Illinois, with 17,244 residents across 413 square miles. That is about 42 people per square mile.
At the 2020 census
| Population | 17,244 |
|---|---|
| Land area | 413 sq mi |
| Density | 42 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Union 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: Union County, IL
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Union County, IL — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Union County, IL
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 9504 | 5,224 | 10.7 | 488 |
| Census Tract 9501 | 4,158 | 113.6 | 37 |
| Census Tract 9505 | 3,577 | 153.2 | 23 |
| Census Tract 9502 | 2,374 | 130.4 | 18 |
| Census Tract 9503 | 1,911 | 5.6 | 343 |
Related places
Other counties nearby
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.