Rock County, WI Demographics
Rock County, WI is the 9th most populous of 72 counties in Wisconsin, with 163,687 residents across 718 square miles. That is about 228 people per square mile.
At the 2020 census
| Population | 163,687 |
|---|---|
| Land area | 718 sq mi |
| Density | 228 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Rock 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 County, WI
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Rock County, WI — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Rock County, WI
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 13.02 | 6,499 | 36.2 | 180 |
| Census Tract 12.02 | 6,280 | 24.9 | 252 |
| Census Tract 14 | 5,871 | 18.5 | 318 |
| Census Tract 12.01 | 5,709 | 30.2 | 189 |
| Census Tract 30.02 | 5,692 | 55.4 | 103 |
| Census Tract 26.01 | 5,470 | 5.4 | 1,008 |
| Census Tract 11 | 5,423 | 1.5 | 3,508 |
| Census Tract 30.01 | 5,323 | 4.0 | 1,336 |
| Census Tract 28 | 5,164 | 110.9 | 47 |
| Census Tract 13.06 | 5,142 | 1.4 | 3,758 |
| Census Tract 17 | 5,096 | 1.2 | 4,425 |
| Census Tract 13.03 | 4,990 | 17.4 | 287 |
| Census Tract 29.02 | 4,972 | 32.6 | 152 |
| Census Tract 31.02 | 4,953 | 19.5 | 255 |
| Census Tract 16 | 4,694 | 0.6 | 7,388 |
| Census Tract 5 | 4,347 | 1.8 | 2,389 |
| Census Tract 18 | 4,249 | 0.9 | 4,568 |
| Census Tract 26.02 | 4,175 | 30.9 | 135 |
| Census Tract 7 | 3,939 | 1.4 | 2,831 |
| Census Tract 8 | 3,928 | 0.9 | 4,491 |
| Census Tract 20 | 3,837 | 1.1 | 3,562 |
| Census Tract 21 | 3,766 | 2.3 | 1,607 |
| Census Tract 29.01 | 3,762 | 38.4 | 98 |
| Census Tract 4 | 3,700 | 1.3 | 2,744 |
| Census Tract 24 | 3,663 | 3.7 | 993 |
| Census Tract 33 | 3,583 | 45.2 | 79 |
| Census Tract 13.05 | 3,560 | 2.0 | 1,819 |
| Census Tract 10 | 3,380 | 2.3 | 1,440 |
| Census Tract 6 | 3,364 | 1.2 | 2,818 |
| Census Tract 9 | 2,878 | 1.2 | 2,306 |
| Census Tract 3 | 2,854 | 0.5 | 6,235 |
| Census Tract 2 | 2,851 | 0.6 | 4,844 |
| Census Tract 31.01 | 2,786 | 14.2 | 197 |
| Census Tract 19 | 2,688 | 0.7 | 4,006 |
| Census Tract 25 | 2,646 | 0.6 | 4,257 |
| Census Tract 32 | 2,577 | 99.7 | 26 |
| Census Tract 27 | 2,490 | 82.7 | 30 |
| Census Tract 15 | 2,321 | 0.8 | 2,915 |
| Census Tract 22 | 2,296 | 22.7 | 101 |
| Census Tract 23 | 1,870 | 1.0 | 1,852 |
| Census Tract 1 | 899 | 0.2 | 3,911 |
Related places
Other counties nearby
Nearest counties
Metro areas containing Rock 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.