Population 164,350 · Census ACS 2020–24
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Population and households in Rock County
Household size in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 2.53 | 2.45 | 2.68 |
| 2010–14 | 2.51 | 2.47 | 2.73 |
| 2015–19 | 2.47 | 2.43 | 2.71 |
| 2020–24 | 2.45 | 2.40 | 2.65 |
| Change | −0.08 | −0.06 | −0.03 |
The average household in Rock County has 2.45 people, under the U.S. average of 2.65. Since 2006–10, household size has edged down from 2.53, in line with the national trend. The biggest households, usually families with children, are concentrated in the southwest.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 38.0 | 38.8 | 37.7 |
| 2010–14 | 39.3 | 39.9 | 38.6 |
| 2015–19 | 40.6 | 40.9 | 39.6 |
| 2020–24 | 40.7 | 41.4 | 40.1 |
| Change | +2.7 | +2.6 | +2.3 |
At 40.7, the median age in Rock County is close to the national median of 40.1, so its age mix looks much like the country's. The median age has climbed from 38.0 in 2006–10, in line with the national trend. Residents skew youngest in the south and oldest in the west.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 12.3% | 10.4% | 12.3% |
| 2010–14 | 13.3% | 10.5% | 12.3% |
| 2015–19 | 12.8% | 10.0% | 11.6% |
| 2020–24 | 11.6% | 9.8% | 11.6% |
| Change | −0.7 pts | −0.6 pts | −0.6 pts |
Single parents head nearly one in eight households in Rock County (11.6%), the same as the national share. Single parents are more common here than in Wisconsin overall (9.8%). Few Wisconsin counties have a higher share of single-parent households: only four of 72.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Rock County
Renters in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 26.5% | 30.5% | 33.3% |
| 2010–14 | 30.2% | 32.3% | 35.6% |
| 2015–19 | 31.6% | 33.0% | 36.0% |
| 2020–24 | 28.8% | 32.2% | 34.8% |
| Change | +2.3 pts | +1.6 pts | +1.5 pts |
Most households in Rock County own their homes; 28.8% rent, a little below the national share of 34.8%. Among homeowners, 37.4% have no mortgage at all, about the same as nationally. Renting is most common in the south and least common in the west. The renter share has risen 2.3 points since 2006–10, as it has nationally.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 8.7% | 10.5% | 11.4% |
| 2010–14 | 8.0% | 10.6% | 11.4% |
| 2015–19 | 7.0% | 10.1% | 11.1% |
| 2020–24 | 6.3% | 9.2% | 9.6% |
| Change | −2.4 pts | −1.3 pts | −1.8 pts |
Vacancy is on the low side in Rock County: 6.3% of homes sit empty, against 9.6% nationally, which points to steady demand for housing. Vacancy is down 2.4 points from 2006–10, in line with the national trend. Rock County has a lower vacancy rate than the great majority of Wisconsin counties.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 1968 | 1970 | 1974 |
| 2010–14 | 1967 | 1971 | 1975 |
| 2015–19 | 1968 | 1972 | 1977 |
| 2020–24 | 1970 | 1974 | 1980 |
| Change | +2 | +5 | +6 |
The housing in Rock County is old by national standards: the median home dates to 1970, against 1980 for the U.S., so buyers will find more older houses, some of them due for updates. Newer construction is concentrated in the northeast, while the south has the oldest housing.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | $749 | $758 | $965 |
| 2010–14 | $803 | $821 | $1,040 |
| 2015–19 | $894 | $904 | $1,213 |
| 2020–24 | $1,094 | $1,139 | $1,571 |
| Change | +$345 | +$380 | +$606 |
Rent in Rock County runs $1,094 a month at the median, utilities included, well below the U.S. median of $1,571. Rent has climbed $345 a month since 2006–10, up 46%, a slower climb than the nation's. The typical renter here spends 27.5% of household income on rent, just under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Rock County
Bachelor's degrees in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 19.8% | 26.5% | 28.4% |
| 2010–14 | 20.3% | 28.0% | 29.6% |
| 2015–19 | 22.2% | 30.4% | 32.1% |
| 2020–24 | 25.9% | 33.6% | 35.6% |
| Change | +6.1 pts | +7.0 pts | +7.2 pts |
Just over a quarter of adults 25 and older in Rock County (25.9%) have a bachelor's degree or higher, below the national share of 35.6%. The share with a degree has risen 6.1 points since 2006–10, in line with the national trend. College graduates are most concentrated in the northwest and least in the southwest.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 87.2% | 89.5% | 84.9% |
| 2010–14 | 88.3% | 90.7% | 86.1% |
| 2015–19 | 90.7% | 92.1% | 87.7% |
| 2020–24 | 92.4% | 93.3% | 89.3% |
| Change | +5.2 pts | +3.8 pts | +4.3 pts |
High school completion in Rock County is a bit above the national rate: 92.4% of adults have a diploma or equivalent, against 89.3%. The picture is much the same across Wisconsin. Since 2006–10, the share with a diploma has risen 5.2 points, in line with the national trend.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Rock County
| Period | Rock County | Wisconsin | U.S. |
|---|---|---|---|
| 2006–10 | 9.2% | 6.7% | 8.1% |
| 2010–14 | 9.5% | 7.3% | 9.4% |
| 2015–19 | 5.3% | 3.7% | 5.6% |
| 2020–24 | 3.8% | 3.3% | 5.4% |
| Change | −5.4 pts | −3.4 pts | −2.7 pts |
Jobs have been easier to find in Rock County than nationally: unemployment was 3.8%, against 5.4%. Unemployment has fallen 5.4 points since 2006–10, in line with the national trend. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Rock County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Rock County | 2.45 | 40.7 | 11.6% | 28.8% | 6.3% | 1970 | $1,094 | 25.9% | 92.4% | 3.8% |
| Walworth County | 2.41 | 42.7 | 9.0% | 29.4% | 16.6% | 1977 | $1,218 | 32.5% | 92.8% | 2.9% |
| Green County | 2.38 | 44.4 | 9.1% | 24.1% | 5.1% | 1970 | $941 | 27.7% | 94.1% | 3.6% |
| Lafayette County | 2.52 | 40.8 | 8.6% | 19.8% | 6.2% | 1965 | $904 | 22.6% | 91.0% | 3.1% |
| Racine County | 2.46 | 42.0 | 13.2% | 29.0% | 7.6% | 1969 | $1,184 | 28.1% | 92.3% | 4.6% |
| Kenosha County | 2.46 | 40.4 | 12.3% | 33.3% | 8.0% | 1976 | $1,290 | 31.4% | 91.9% | 4.5% |
| Allegan County | 2.69 | 41.5 | 9.7% | 12.6% | 12.1% | 1980 | $1,163 | 27.0% | 92.5% | 2.9% |
| Bremer County | 2.49 | 38.7 | 8.7% | 20.3% | 8.2% | 1967 | $920 | 37.3% | 96.3% | 3.0% |
| Barry County | 2.64 | 43.3 | 7.4% | 12.7% | 11.2% | 1976 | $1,007 | 24.6% | 93.2% | 4.0% |
| Butler County | 2.41 | 44.2 | 7.0% | 15.9% | 10.9% | 1957 | $743 | 21.5% | 94.0% | 3.0% |
| Franklin County | 2.35 | 45.8 | 10.2% | 27.6% | 10.9% | 1950 | $730 | 19.5% | 90.2% | 3.6% |
All figures 2020–24.
Counties with similar populations: Carroll County, MD · Porter County, IN · Johnson County, IN · Kenosha County, WI · Kent County, RI · Aiken County, SC · Kootenai County, ID · Midland County, TX · Monroe County, MI · Monroe County, PA
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Rock County. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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