| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 697 | 2,236 | 2,992 | |
| 2020 | R | 721 | 2,235 | 3,001 | |
| 2016 | R | 704 | 2,105 | 2,974 | |
| 2012 | R | 1,167 | 1,830 | 3,074 | |
| 2008 | R | 1,367 | 1,712 | 3,175 | |
| 2004 | R | 1,293 | 2,063 | 3,408 | |
| 2000 | D | 1,901 | 1,162 | 3,139 | |
| 1996 | D | 1,569 | 1,428 | 3,436 | |
| 1992 | D | 1,294 | 1,212 | 3,367 | |
| 1988 | R | 1,574 | 1,826 | 3,417 | |
| 1984 | R | 1,408 | 2,478 | 3,906 | |
| 1980 | R | 1,191 | 2,794 | 4,239 | |
| 1976 | D | 2,154 | 1,897 | 4,073 | |
| 1972 | D | 2,368 | 2,116 | 4,493 | |
| 1968 | R | 1,773 | 2,411 | 4,383 | |
| 1964 | D | 2,494 | 1,784 | 4,278 | |
| 1960 | R | 2,052 | 2,730 | 4,782 | |
| 1956 | R | 2,144 | 2,696 | 4,840 | |
| 1952 | R | 1,658 | 3,157 | 4,815 | |
| 1948 | R | 2,077 | 2,283 | 4,408 | |
| 1944 | R | 1,981 | 2,553 | 4,534 | |
| 1940 | R | 2,463 | 3,046 | 5,509 | |
| 1936 | D | 2,959 | 2,236 | 5,299 | |
| 1932 | D | 3,504 | 1,354 | 4,886 | |
| 1928 | R | 2,166 | 2,262 | 4,441 | |
| 1924 | R | 860 | 1,420 | 3,398 | |
| 1920 | R | 960 | 1,872 | 3,517 | |
| 1916 | R | 1,231 | 1,278 | 2,569 | |
| 1912 | D | 1,059 | 0 | 2,372 | |
| 1908 | R | 1,014 | 1,324 | 2,396 | |
| 1904 | R | 886 | 1,547 | 2,483 | |
| 1900 | R | 1,028 | 1,271 | 2,314 | |
| 1896 | R | 893 | 1,163 | 2,063 | |
| 1892 | R | 260 | 879 | 1,775 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Bon Homme County, anchored by the Missouri River bottomlands and a tight-knit agricultural economy, has delivered Republican presidential margins above 50 points in recent cycles, reflecting the deep-red alignment typical of South Dakota's rural, small-population counties.
The Republican margin in Bon Homme County reached its widest at fifty-one points in 2024. The margin in 2024 was fifty-one points, in line with the county's deep historical pattern.
Bon Homme County's loyalty is rooted in its place. Median household income of $64,435, a 87% non-Hispanic-white share, and a population of 7,044 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 Kingsbury County.
