Rock County's estimated 2026 population is 167,497 with a growth rate of 0.61% in the past year according to the most recent United States census data. Rock County is the 9th largest county in Wisconsin. The 2010 population was 160,261 and has seen a growth of 4.52% since that time.
Data after 2023 is projected based on recent change
The racial composition of Rock County includes 82.35% White, 4.65% Black or African American, 3.37% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (82.35%)
Two or more races (8.19%)
Black or African American (4.65%)
Other race (3.37%)
Asian (1.14%)
Native American (0.28%)
Native Hawaiian or Pacific Islander (0.02%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 135,003 | 82.35% |
| Two or more races | 13,424 | 8.19% |
| Black or African American | 7,630 | 4.65% |
| Other race | 5,521 | 3.37% |
| Asian | 1,877 | 1.14% |
| Native American | 464 | 0.28% |
| Native Hawaiian or Pacific Islander | 25 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
Rock County's average per capita income is $48,589. Household income levels show a median of $74,390. The poverty rate stands at 9.97%.
Name | Median | Mean |
|---|---|---|
| Married Families | $102,632 | $117,924 |
| Families | $88,311 | $103,922 |
| Households | $74,390 | $89,673 |
| Non Families | $44,941 | $59,884 |
Average Income
Median Household Income
Poverty Rate