| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 5,944 | 14,983 | 21,464 | |
| 2020 | R | 6,292 | 15,033 | 21,770 | |
| 2016 | R | 5,389 | 13,365 | 20,095 | |
| 2012 | R | 6,522 | 11,654 | 18,571 | |
| 2008 | R | 8,748 | 9,526 | 18,565 | |
| 2004 | R | 5,210 | 11,726 | 17,066 | |
| 2000 | R | 5,090 | 10,134 | 15,504 | |
| 1996 | R | 6,499 | 6,840 | 15,250 | |
| 1992 | R | 5,878 | 6,785 | 15,989 | |
| 1988 | R | 5,954 | 9,995 | 16,048 | |
| 1984 | R | 5,423 | 9,391 | 14,962 | |
| 1980 | R | 6,700 | 6,775 | 14,276 | |
| 1976 | D | 7,385 | 6,383 | 13,884 | |
| 1972 | R | 6,365 | 6,637 | 13,179 | |
| 1968 | D | 6,725 | 5,865 | 13,563 | |
| 1964 | D | 10,114 | 3,800 | 13,939 | |
| 1960 | D | 8,214 | 5,117 | 13,353 | |
| 1956 | R | 5,177 | 6,942 | 12,139 | |
| 1952 | R | 5,658 | 6,538 | 12,227 | |
| 1948 | D | 6,564 | 4,295 | 10,928 | |
| 1944 | D | 5,273 | 4,855 | 10,162 | |
| 1940 | D | 5,992 | 4,729 | 10,745 | |
| 1936 | D | 6,927 | 3,011 | 10,359 | |
| 1932 | D | 7,547 | 2,357 | 9,996 | |
| 1928 | D | 6,044 | 3,301 | 9,384 | |
| 1924 | D | 5,651 | 2,708 | 8,870 | |
| 1920 | D | 4,238 | 3,738 | 8,095 | |
| 1916 | D | 3,072 | 1,492 | 4,653 | |
| 1912 | D | 3,059 | 666 | 4,498 | |
| 1908 | D | 3,344 | 1,397 | 4,838 | |
| 1904 | D | 3,119 | 1,413 | 4,592 | |
| 1900 | D | 3,192 | 1,362 | 4,594 | |
| 1896 | D | 3,005 | 1,215 | 4,243 | |
| 1892 | D | 2,847 | 1,081 | 4,138 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Dubois County's R+42.2 margin in 2024 reflects a heavily rural, manufacturing-rooted community in southwestern Indiana where Republican presidential candidates have dominated for decades with some of the state's widest winning spreads.
The unraveling was not abrupt. The Democratic margin in Dubois County peaked at fifty-three points in 1912; it narrowed steadily over the late twentieth century. The 1980 election delivered the county to the Republican party for the first time in many years, by a margin of one points. By 2024, the margin had widened further.
The economic and demographic context is severe. Dubois County's median household income of $75,979 is among the lowest of any county in the United States; 11% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Yellowstone County and Jefferson County.