DeKalb County, IL Demographics
DeKalb County, IL is the 20th most populous of 102 counties in Illinois, with 100,420 residents across 631 square miles. That is about 159 people per square mile.
At the 2020 census
| Population | 100,420 |
|---|---|
| Land area | 631 sq mi |
| Density | 159 / sq mi |
Data: 2020 Census · American Community Survey 2024
How DeKalb 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: DeKalb County, IL
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around DeKalb County, IL — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in DeKalb County, IL
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 1 | 6,737 | 38.4 | 176 |
| Census Tract 8 | 6,635 | 7.0 | 950 |
| Census Tract 14 | 6,371 | 13.5 | 472 |
| Census Tract 6 | 5,919 | 2.3 | 2,584 |
| Census Tract 10.02 | 5,860 | 1.3 | 4,392 |
| Census Tract 13 | 5,267 | 1.0 | 5,535 |
| Census Tract 4.02 | 5,184 | 33.9 | 153 |
| Census Tract 9 | 4,960 | 1.8 | 2,742 |
| Census Tract 20 | 4,732 | 3.8 | 1,249 |
| Census Tract 2 | 4,513 | 69.3 | 65 |
| Census Tract 16 | 4,383 | 28.6 | 153 |
| Census Tract 10.03 | 4,134 | 0.3 | 13,934 |
| Census Tract 5 | 4,070 | 8.0 | 506 |
| Census Tract 4.01 | 3,975 | 18.9 | 210 |
| Census Tract 15 | 3,831 | 14.8 | 258 |
| Census Tract 18 | 3,764 | 145.9 | 26 |
| Census Tract 7 | 3,694 | 1.6 | 2,357 |
| Census Tract 17 | 3,388 | 85.4 | 40 |
| Census Tract 22 | 3,285 | 0.5 | 6,849 |
| Census Tract 3 | 2,520 | 110.3 | 23 |
| Census Tract 21 | 2,461 | 2.8 | 881 |
| Census Tract 10.04 | 2,374 | 6.7 | 356 |
| Census Tract 19 | 2,363 | 35.2 | 67 |
Related places
Other counties nearby
Nearest counties
Metro areas containing DeKalb 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.