| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 10,643 | 14,726 | 25,678 | |
| 2020 | R | 9,897 | 13,173 | 23,524 | |
| 2016 | R | 9,034 | 11,486 | 22,106 | |
| 2012 | D | 11,316 | 10,224 | 21,992 | |
| 2008 | D | 13,002 | 9,566 | 22,989 | |
| 2004 | D | 12,039 | 10,879 | 23,172 | |
| 2000 | D | 9,172 | 8,911 | 19,330 | |
| 1996 | D | 7,536 | 4,917 | 15,415 | |
| 1992 | D | 7,965 | 5,283 | 18,218 | |
| 1988 | D | 9,205 | 7,273 | 16,594 | |
| 1984 | R | 7,712 | 8,473 | 16,358 | |
| 1980 | D | 7,743 | 7,428 | 17,088 | |
| 1976 | D | 7,882 | 6,751 | 15,004 | |
| 1972 | R | 5,681 | 6,660 | 12,556 | |
| 1968 | R | 4,392 | 5,415 | 10,526 | |
| 1964 | D | 6,475 | 3,964 | 10,458 | |
| 1960 | R | 4,487 | 6,723 | 11,239 | |
| 1956 | R | 4,189 | 6,401 | 10,604 | |
| 1952 | R | 3,593 | 7,475 | 11,094 | |
| 1948 | D | 4,894 | 4,319 | 9,382 | |
| 1944 | R | 3,853 | 5,980 | 9,905 | |
| 1940 | R | 4,545 | 6,968 | 11,639 | |
| 1936 | D | 5,619 | 4,570 | 10,975 | |
| 1932 | D | 4,936 | 3,898 | 9,108 | |
| 1928 | R | 2,045 | 7,096 | 9,274 | |
| 1924 | R | 284 | 3,177 | 7,916 | |
| 1920 | R | 491 | 5,596 | 6,370 | |
| 1916 | R | 1,447 | 2,556 | 4,257 | |
| 1912 | R | 833 | 1,403 | 3,746 | |
| 1908 | R | 914 | 3,297 | 4,432 | |
| 1904 | R | 546 | 3,303 | 4,065 | |
| 1900 | R | 1,110 | 3,046 | 4,303 | |
| 1896 | R | 1,418 | 3,370 | 4,960 | |
| 1892 | R | 1,257 | 2,169 | 4,259 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Dunn County's economy anchors on agriculture and the University of Wisconsin–Stout campus in Menomonie, a combination that once made it competitive but has trended Republican by double digits in recent presidential cycles.
The Democratic margin in Dunn County has rarely exceeded twenty-four points in modern history; the Republican margin has rarely exceeded eighty points. 2024 delivered the county to the Republican candidate by sixteen points.
Dunn County's demographics resemble the country more than they resemble most counties. A 91% non-Hispanic-white share, a 11% poverty rate, and a median household income of $74,824 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Gogebic County and Cowlitz County.