Rock County's estimated 2026 population is 167,279 with a growth rate of 0.48% 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 4.38% since that time.
Data after 2023 is projected based on recent change
Overall: 40.3 years
Female: 41.4 years
Male: 39.1 years
There are 127,547 adults, (29,268 of whom are seniors) in Rock County.
Female: 82,546 (50.2%)
Male: 81,804 (49.8%)
The racial composition of Rock County includes 81.63% White, 4.7% Black or African American, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 134,161 | 81.63% |
| Two or more races | 15,328 | 9.33% |
| Black or African American | 7,727 | 4.7% |
| Other race | 4,782 | 2.91% |
| Asian | 1,779 | 1.08% |
| Native American | 564 | 0.34% |
| Native Hawaiian or Pacific Islander | 9 | 0.01% |
Rock County's average per capita income is $50,055. Household income levels show a median of $75,673. The poverty rate stands at 9.26%.
Name | Median | Mean |
|---|---|---|
| Married Families | $104,227 | $121,135 |
| Families | $90,467 | $106,271 |
| Households | $75,673 | $91,984 |
| Non Families | $45,841 | $61,565 |
Average Income
Median Household Income
Poverty Rate