| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 946 | 2,594 | 3,630 | |
| 2020 | R | 1,056 | 2,618 | 3,745 | |
| 2016 | R | 971 | 2,382 | 3,564 | |
| 2012 | R | 1,493 | 2,034 | 3,606 | |
| 2008 | R | 1,786 | 1,951 | 3,830 | |
| 2004 | R | 1,633 | 2,392 | 4,090 | |
| 2000 | D | 2,235 | 1,475 | 3,830 | |
| 1996 | D | 1,805 | 1,782 | 4,083 | |
| 1992 | R | 1,484 | 1,595 | 4,110 | |
| 1988 | R | 1,988 | 2,148 | 4,172 | |
| 1984 | R | 1,606 | 2,738 | 4,360 | |
| 1980 | R | 1,602 | 2,691 | 4,594 | |
| 1976 | D | 2,398 | 2,051 | 4,464 | |
| 1972 | R | 2,231 | 2,247 | 4,490 | |
| 1968 | R | 1,890 | 2,259 | 4,360 | |
| 1964 | D | 2,583 | 1,854 | 4,437 | |
| 1960 | R | 2,114 | 2,611 | 4,725 | |
| 1956 | R | 2,070 | 2,621 | 4,691 | |
| 1952 | R | 1,500 | 3,234 | 4,734 | |
| 1948 | D | 2,052 | 1,972 | 4,060 | |
| 1944 | R | 1,475 | 2,278 | 3,753 | |
| 1940 | R | 2,039 | 2,981 | 5,020 | |
| 1936 | D | 2,101 | 1,847 | 4,059 | |
| 1932 | D | 2,887 | 1,515 | 4,472 | |
| 1928 | R | 1,656 | 2,508 | 4,216 | |
| 1924 | R | 202 | 1,227 | 2,920 | |
| 1920 | R | 350 | 1,813 | 3,022 | |
| 1916 | D | 1,098 | 772 | 1,985 | |
| 1912 | D | 619 | 0 | 1,582 | |
| 1908 | R | 628 | 1,122 | 1,874 | |
| 1904 | R | 309 | 1,454 | 1,887 | |
| 1900 | R | 716 | 1,305 | 2,076 | |
| 1896 | R | 902 | 1,029 | 1,952 | |
| 1892 | R | 188 | 605 | 1,485 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Grant County sits in the Coteau des Prairies, where a thinly spread agricultural population has delivered Republican presidential margins above 40 points in recent cycles, making it among the least competitive counties in the state.
The Republican margin in Grant County reached its widest at sixty-one points in 1904. The margin in 2024 was forty-five points, in line with the county's deep historical pattern.
Grant County's loyalty is rooted in its place. Median household income of $75,028, a 91% non-Hispanic-white share, and a population of 7,563 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 Clark County and Bon Homme County.
