Lee County, IL Demographics
Lee County, IL is the 42nd most populous of 102 counties in Illinois, with 34,145 residents across 725 square miles. That is about 47 people per square mile.
At the 2020 census
| Population | 34,145 |
|---|---|
| Land area | 725 sq mi |
| Density | 47 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Lee 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: Lee County, IL
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Lee County, IL — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Lee County, IL
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 4 | 7,503 | 8.2 | 919 |
| Census Tract 5 | 4,709 | 36.0 | 131 |
| Census Tract 3 | 4,072 | 5.2 | 789 |
| Census Tract 6 | 3,425 | 2.0 | 1,720 |
| Census Tract 8 | 3,399 | 80.1 | 42 |
| Census Tract 9 | 3,239 | 167.5 | 19 |
| Census Tract 2 | 3,227 | 97.2 | 33 |
| Census Tract 1 | 2,762 | 159.9 | 17 |
| Census Tract 7 | 1,809 | 168.7 | 11 |
Related places
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Nearest counties
Metro areas containing Lee County
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.