Clark County, IL Demographics
Clark County, IL is the 71st most populous of 102 counties in Illinois, with 15,455 residents across 501 square miles. That is about 31 people per square mile.
At the 2020 census
| Population | 15,455 |
|---|---|
| Land area | 501 sq mi |
| Density | 31 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Clark 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: Clark County, IL
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Clark County, IL — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Clark County, IL
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 603 | 4,850 | 56.5 | 86 |
| Census Tract 601 | 4,696 | 285.2 | 16 |
| Census Tract 602 | 4,312 | 10.8 | 398 |
| Census Tract 604 | 1,597 | 148.9 | 11 |
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.