Rock Island County, IL Demographics
Rock Island County, IL is the 14th most populous of 102 counties in Illinois, with 144,672 residents across 427 square miles. That is about 338 people per square mile.
At the 2020 census
| Population | 144,672 |
|---|---|
| Land area | 427 sq mi |
| Density | 338 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Rock Island 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: Rock Island County, IL
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Rock Island County, IL — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Rock Island County, IL
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 204 | 5,967 | 11.3 | 526 |
| Census Tract 209 | 5,715 | 1.4 | 4,143 |
| Census Tract 241.02 | 5,383 | 36.0 | 150 |
| Census Tract 228 | 5,335 | 0.8 | 6,567 |
| Census Tract 208 | 5,110 | 1.8 | 2,891 |
| Census Tract 232 | 4,931 | 1.2 | 3,970 |
| Census Tract 218 | 4,837 | 1.9 | 2,552 |
| Census Tract 213 | 4,772 | 1.5 | 3,196 |
| Census Tract 212 | 4,634 | 1.4 | 3,289 |
| Census Tract 215 | 4,358 | 1.3 | 3,403 |
| Census Tract 203.01 | 4,358 | 1.3 | 3,450 |
| Census Tract 240 | 4,186 | 8.9 | 468 |
| Census Tract 220 | 4,077 | 1.2 | 3,524 |
| Census Tract 242 | 4,045 | 4.0 | 1,013 |
| Census Tract 222 | 4,006 | 0.7 | 5,769 |
| Census Tract 230 | 3,998 | 1.8 | 2,212 |
| Census Tract 211 | 3,862 | 3.7 | 1,040 |
| Census Tract 210 | 3,812 | 1.0 | 3,814 |
| Census Tract 241.03 | 3,777 | 147.8 | 26 |
| Census Tract 217 | 3,676 | 0.6 | 5,694 |
| Census Tract 202 | 3,624 | 11.1 | 327 |
| Census Tract 201.02 | 3,609 | 52.5 | 69 |
| Census Tract 241.01 | 3,590 | 50.4 | 71 |
| Census Tract 233 | 3,254 | 0.6 | 5,197 |
| Census Tract 229 | 2,815 | 0.5 | 5,559 |
| Census Tract 231 | 2,745 | 1.4 | 2,033 |
| Census Tract 216 | 2,687 | 0.5 | 5,707 |
| Census Tract 243 | 2,566 | 9.8 | 263 |
| Census Tract 221 | 2,553 | 0.6 | 4,144 |
| Census Tract 201.01 | 2,545 | 33.4 | 76 |
| Census Tract 203.02 | 2,426 | 1.7 | 1,387 |
| Census Tract 237 | 2,322 | 1.1 | 2,174 |
| Census Tract 206 | 2,267 | 1.9 | 1,177 |
| Census Tract 223 | 2,081 | 1.0 | 2,022 |
| Census Tract 226 | 2,014 | 0.9 | 2,195 |
| Census Tract 245 | 1,969 | 2.2 | 876 |
| Census Tract 235 | 1,943 | 0.3 | 5,655 |
| Census Tract 244 | 1,896 | 1.1 | 1,768 |
| Census Tract 207 | 1,615 | 0.3 | 6,380 |
| Census Tract 236 | 1,609 | 0.4 | 3,866 |
| Census Tract 219 | 1,594 | 2.0 | 792 |
| Census Tract 214 | 1,175 | 0.5 | 2,557 |
| Census Tract 201.03 | 934 | 23.7 | 39 |
Related places
Other counties nearby
Nearest counties
Metro areas containing Rock Island 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.