| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 7,083 | 17,580 | 25,226 | |
| 2020 | R | 8,015 | 18,543 | 27,159 | |
| 2016 | R | 7,029 | 17,009 | 25,592 | |
| 2012 | R | 9,589 | 15,151 | 25,329 | |
| 2008 | R | 11,293 | 14,734 | 26,299 | |
| 2004 | R | 8,509 | 18,769 | 27,460 | |
| 2000 | R | 9,712 | 16,153 | 26,386 | |
| 1996 | R | 9,818 | 13,443 | 26,478 | |
| 1992 | R | 9,211 | 13,806 | 28,738 | |
| 1988 | R | 10,799 | 18,441 | 29,371 | |
| 1984 | R | 9,986 | 20,482 | 30,673 | |
| 1980 | R | 10,390 | 19,078 | 30,909 | |
| 1976 | R | 13,468 | 16,847 | 30,554 | |
| 1972 | R | 7,912 | 20,969 | 28,958 | |
| 1968 | R | 10,938 | 16,170 | 30,826 | |
| 1964 | D | 17,574 | 14,688 | 32,494 | |
| 1960 | R | 13,642 | 19,021 | 32,841 | |
| 1956 | R | 9,455 | 17,548 | 27,206 | |
| 1952 | R | 10,646 | 16,678 | 27,923 | |
| 1948 | R | 12,212 | 13,138 | 26,115 | |
| 1944 | R | 11,031 | 14,527 | 26,379 | |
| 1940 | R | 13,257 | 15,187 | 28,779 | |
| 1936 | D | 13,655 | 11,774 | 26,260 | |
| 1932 | D | 13,390 | 11,398 | 25,961 | |
| 1928 | R | 7,273 | 14,659 | 22,216 | |
| 1924 | R | 7,086 | 11,173 | 20,276 | |
| 1920 | R | 7,900 | 12,349 | 22,405 | |
| 1916 | R | 5,827 | 6,059 | 13,967 | |
| 1912 | D | 4,390 | 3,939 | 13,036 | |
| 1908 | R | 5,819 | 7,181 | 14,531 | |
| 1904 | R | 4,668 | 9,550 | 16,388 | |
| 1900 | R | 5,312 | 8,832 | 15,284 | |
| 1896 | R | 5,072 | 7,723 | 13,100 | |
| 1892 | R | 3,590 | 4,916 | 9,415 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Grant County, anchored by Marion, has shifted decisively toward Republican presidential candidates over successive cycles, posting a 41-point margin in 2024 despite a modest population base of roughly 73,000 residents.
The Democratic margin in Grant County peaked at nine points in 1964. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-two points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Grant County's median household income of $53,522 sits well below state and national norms, and 20% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Clinton County and Rush County.