| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,592 | 10,314 | 13,034 | |
| 2020 | R | 2,990 | 10,645 | 13,799 | |
| 2016 | R | 2,628 | 9,822 | 13,250 | |
| 2012 | R | 4,557 | 7,750 | 12,826 | |
| 2008 | R | 4,777 | 8,247 | 13,371 | |
| 2004 | R | 5,366 | 8,576 | 13,993 | |
| 2000 | R | 4,872 | 7,511 | 12,776 | |
| 1996 | D | 5,386 | 5,135 | 12,466 | |
| 1992 | R | 5,350 | 5,776 | 13,738 | |
| 1988 | R | 4,834 | 7,399 | 12,349 | |
| 1984 | R | 4,251 | 8,194 | 12,554 | |
| 1980 | R | 4,406 | 6,469 | 11,404 | |
| 1976 | R | 4,971 | 5,198 | 10,317 | |
| 1972 | R | 2,341 | 6,506 | 8,986 | |
| 1968 | R | 2,660 | 5,134 | 8,836 | |
| 1964 | D | 4,740 | 4,408 | 9,148 | |
| 1960 | R | 3,498 | 7,602 | 11,100 | |
| 1956 | R | 2,877 | 7,040 | 9,917 | |
| 1952 | R | 3,153 | 6,763 | 9,916 | |
| 1948 | R | 3,430 | 5,743 | 9,207 | |
| 1944 | R | 2,968 | 6,464 | 9,432 | |
| 1940 | R | 3,943 | 7,285 | 11,228 | |
| 1936 | R | 4,548 | 6,700 | 11,275 | |
| 1932 | R | 4,190 | 5,646 | 10,002 | |
| 1928 | R | 1,916 | 5,513 | 7,509 | |
| 1924 | R | 2,284 | 4,325 | 7,066 | |
| 1920 | R | 2,562 | 5,388 | 7,994 | |
| 1916 | R | 2,277 | 2,860 | 5,228 | |
| 1912 | D | 1,765 | 1,355 | 5,370 | |
| 1908 | R | 2,171 | 3,914 | 6,166 | |
| 1904 | R | 1,742 | 3,880 | 5,747 | |
| 1900 | R | 2,388 | 4,159 | 6,620 | |
| 1896 | R | 2,369 | 4,247 | 6,671 | |
| 1892 | R | 1,984 | 3,547 | 5,722 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Gallia County, tucked along the Ohio River in the state's Appalachian southeast, delivered a 59-point Republican presidential margin in 2024 — among the widest in the state — reflecting a rural, working-class electorate that has shifted decisively rightward over two decades.
The Democratic margin in Gallia County peaked at eight points in 1912. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-nine points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Gallia County's median household income of $56,830 sits well below state and national norms, and 16% 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 Jackson County and Brown County.