| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 8,185 | 15,881 | 24,634 | |
| 2020 | R | 8,901 | 16,300 | 25,799 | |
| 2016 | R | 6,964 | 14,668 | 23,367 | |
| 2012 | R | 8,959 | 12,054 | 21,553 | |
| 2008 | D | 11,618 | 11,501 | 23,603 | |
| 2004 | D | 12,771 | 12,150 | 25,194 | |
| 2000 | D | 12,315 | 9,972 | 22,873 | |
| 1996 | D | 12,994 | 6,160 | 22,107 | |
| 1992 | D | 14,042 | 6,380 | 25,194 | |
| 1988 | D | 14,441 | 9,229 | 23,742 | |
| 1984 | D | 13,833 | 13,106 | 27,020 | |
| 1980 | D | 14,189 | 10,952 | 26,471 | |
| 1976 | D | 17,800 | 10,391 | 28,191 | |
| 1972 | R | 11,864 | 16,095 | 27,959 | |
| 1968 | D | 17,246 | 10,177 | 29,261 | |
| 1964 | D | 22,047 | 7,707 | 29,754 | |
| 1960 | D | 17,903 | 14,138 | 32,041 | |
| 1956 | D | 16,192 | 16,112 | 32,304 | |
| 1952 | D | 19,890 | 14,979 | 34,869 | |
| 1948 | D | 19,866 | 11,201 | 31,357 | |
| 1944 | D | 17,640 | 11,584 | 29,224 | |
| 1940 | D | 21,035 | 13,349 | 34,384 | |
| 1936 | D | 20,859 | 11,403 | 32,443 | |
| 1932 | D | 15,975 | 12,638 | 29,464 | |
| 1928 | R | 10,133 | 16,088 | 26,663 | |
| 1924 | R | 9,386 | 12,167 | 24,066 | |
| 1920 | R | 8,734 | 11,494 | 20,811 | |
| 1916 | D | 5,493 | 4,443 | 10,379 | |
| 1912 | D | 4,535 | 1,625 | 9,433 | |
| 1908 | R | 3,961 | 4,368 | 8,901 | |
| 1904 | R | 3,762 | 4,776 | 8,815 | |
| 1900 | D | 4,351 | 3,612 | 8,101 | |
| 1896 | R | 3,304 | 3,420 | 6,855 | |
| 1892 | D | 2,662 | 2,584 | 5,456 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Marion County's coal and industrial heritage once made it a Democratic stronghold, but the 2024 presidential margin of R+31.2 reflects a realignment driven by demographic change and the long decline of unionized extraction industries.
The 2012 election was the turning point, when the Republican candidate carried the county by fourteen points. The 2024 margin was thirty-one points, in line with the county's new direction.
The demographics suggest why. A population of 55,909, a 92% non-Hispanic-white share, and a median household income of $67,370 situate the county in the broader realignment patterns of recent cycles. The county's voting pattern over the last decade is most similar to that of Fayette County and Logan County.
