| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,192 | 6,755 | 8,078 | |
| 2020 | R | 1,268 | 6,794 | 8,200 | |
| 2016 | R | 1,373 | 5,725 | 7,275 | |
| 2012 | R | 1,468 | 4,829 | 6,479 | |
| 2008 | R | 1,562 | 5,023 | 6,793 | |
| 2004 | R | 2,524 | 4,205 | 6,770 | |
| 2000 | R | 2,535 | 3,285 | 6,013 | |
| 1996 | D | 2,948 | 1,925 | 5,536 | |
| 1992 | D | 3,190 | 2,272 | 6,198 | |
| 1988 | R | 2,142 | 2,717 | 4,904 | |
| 1984 | R | 2,148 | 3,167 | 5,353 | |
| 1980 | D | 3,078 | 2,007 | 5,276 | |
| 1976 | D | 3,797 | 1,047 | 4,844 | |
| 1972 | R | 1,147 | 2,414 | 3,581 | |
| 1968 | D | 852 | 627 | 3,673 | |
| 1964 | D | 1,678 | 1,308 | 3,047 | |
| 1960 | D | 1,394 | 563 | 2,269 | |
| 1956 | D | 1,272 | 818 | 2,139 | |
| 1952 | D | 1,487 | 637 | 2,135 | |
| 1948 | D | 883 | 121 | 1,235 | |
| 1944 | D | 1,088 | 334 | 1,422 | |
| 1940 | D | 1,043 | 160 | 1,203 | |
| 1936 | D | 978 | 147 | 1,126 | |
| 1932 | D | 1,626 | 55 | 1,685 | |
| 1928 | D | 1,045 | 439 | 1,486 | |
| 1924 | D | 628 | 133 | 858 | |
| 1920 | D | 619 | 230 | 865 | |
| 1916 | D | 957 | 190 | 1,147 | |
| 1912 | D | 440 | 110 | 622 | |
| 1908 | D | 524 | 160 | 752 | |
| 1904 | D | 406 | 151 | 560 | |
| 1900 | D | 574 | 175 | 749 | |
| 1896 | D | 801 | 125 | 931 | |
| 1892 | D | 695 | 156 | 913 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Grant County's R+68.9 presidential margin in 2024 places it among the most one-sided rural counties in the state, reflecting a heavily white, non-metropolitan electorate where Democratic candidates have struggled to find a foothold for decades.
The unraveling was not abrupt. The Democratic margin in Grant County peaked at ninety-three points in 1932; it narrowed steadily over the late twentieth century. The 2000 election delivered the county to the Republican party for the first time in many years, by a margin of twelve points. By 2024, the margin had widened further.
The economic and demographic context is severe. Grant County's median household income of $71,549 is among the lowest of any county in the United States; 13% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Lafourche Parish and Miller County.
