2024 results by precinct
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Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 46,642 | 40,218 | 88,310 | |
| 2020 | D | 46,658 | 37,138 | 85,360 | |
| 2016 | D | 39,339 | 31,493 | 76,074 | |
| 2012 | D | 49,219 | 30,517 | 80,690 | |
| 2008 | D | 50,529 | 27,364 | 79,169 | |
| 2004 | D | 46,598 | 33,151 | 80,479 | |
| 2000 | D | 40,472 | 27,467 | 70,404 | |
| 1996 | D | 32,450 | 20,096 | 60,320 | |
| 1992 | D | 31,154 | 21,942 | 69,025 | |
| 1988 | D | 29,576 | 28,178 | 58,188 | |
| 1984 | R | 26,433 | 32,491 | 59,334 | |
| 1980 | R | 24,740 | 30,960 | 61,182 | |
| 1976 | R | 28,048 | 28,325 | 57,762 | |
| 1972 | R | 21,033 | 30,361 | 52,319 | |
| 1968 | R | 20,567 | 25,229 | 49,493 | |
| 1964 | D | 28,257 | 20,372 | 48,684 | |
| 1960 | R | 19,194 | 29,675 | 48,945 | |
| 1956 | R | 13,834 | 28,980 | 42,987 | |
| 1952 | R | 15,183 | 27,837 | 43,065 | |
| 1948 | R | 16,150 | 17,068 | 33,692 | |
| 1944 | R | 16,766 | 18,477 | 35,376 | |
| 1940 | R | 17,543 | 20,141 | 37,898 | |
| 1936 | D | 17,991 | 14,693 | 33,729 | |
| 1932 | R | 12,612 | 16,825 | 30,008 | |
| 1928 | R | 8,726 | 21,497 | 30,384 | |
| 1924 | R | 1,453 | 14,815 | 24,320 | |
| 1920 | R | 2,447 | 16,152 | 19,337 | |
| 1916 | R | 4,015 | 7,011 | 11,477 | |
| 1912 | R | 3,032 | 4,276 | 9,895 | |
| 1908 | R | 3,227 | 7,839 | 11,734 | |
| 1904 | R | 2,348 | 7,972 | 11,127 | |
| 1900 | R | 3,094 | 8,249 | 11,790 | |
| 1896 | R | 3,655 | 8,282 | 12,277 | |
| 1892 | R | 4,231 | 6,052 | 10,956 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
American
100.0%
African American
3.8%
Multiple ancestry combinations reported; no single grouping above 1%.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 40.3 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$75,673
Rock County ranks in the top 25% of US counties.
Rock County$75,673
Wisconsin$77,485
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
9.3%
Children face moderate poverty.
Children under 1818.0%
Working age (18–64)100.0%
Seniors (65+)18.0%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
0.0%
speak English only
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 61.7% of residents not counted as adherents by any reporting body.
Rock County anchors south-central Wisconsin around Janesville, a former GM factory town whose blue-collar workforce has made it a consistent but narrowing Democratic margin county in statewide races.
The Democratic margin in Rock County reached its widest at twenty-nine points in 2008. The margin in 2024 was seven points — still decisive.
Rock County's loyalty is rooted in its place. Median household income of $75,673, a 82% non-Hispanic-white share, and a population of 164,350 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Lucas County and Iowa County.
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