Williamson County, IL Demographics
Williamson County, IL is the 22nd most populous of 102 counties in Illinois, with 67,153 residents across 420 square miles. That is about 160 people per square mile.
At the 2020 census
| Population | 67,153 |
|---|---|
| Land area | 420 sq mi |
| Density | 160 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Williamson 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: Williamson County, IL
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Williamson County, IL — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Williamson County, IL
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 202.01 | 5,552 | 8.7 | 640 |
| Census Tract 214 | 5,502 | 97.3 | 57 |
| Census Tract 203 | 5,067 | 16.2 | 313 |
| Census Tract 207 | 4,791 | 18.2 | 263 |
| Census Tract 209 | 4,704 | 15.9 | 295 |
| Census Tract 213 | 4,688 | 32.3 | 145 |
| Census Tract 212 | 4,404 | 3.3 | 1,334 |
| Census Tract 208.02 | 4,131 | 104.0 | 40 |
| Census Tract 206 | 3,798 | 17.3 | 220 |
| Census Tract 204 | 3,496 | 1.1 | 3,288 |
| Census Tract 201 | 3,483 | 24.6 | 141 |
| Census Tract 205 | 3,400 | 1.9 | 1,786 |
| Census Tract 202.02 | 3,150 | 5.5 | 572 |
| Census Tract 211 | 2,958 | 1.3 | 2,299 |
| Census Tract 208.01 | 2,806 | 59.1 | 47 |
| Census Tract 210.01 | 2,594 | 1.4 | 1,795 |
| Census Tract 210.02 | 1,509 | 10.5 | 143 |
| Census Tract 210.03 | 1,120 | 1.6 | 715 |
Related places
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Metro areas containing Williamson 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.