| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,170 | 5,621 | 7,901 | |
| 2020 | R | 2,362 | 5,477 | 7,958 | |
| 2016 | R | 1,970 | 4,944 | 7,219 | |
| 2012 | R | 2,592 | 4,197 | 6,881 | |
| 2008 | R | 2,891 | 4,102 | 7,121 | |
| 2004 | R | 2,644 | 4,381 | 7,079 | |
| 2000 | R | 2,178 | 3,572 | 5,873 | |
| 1996 | R | 2,444 | 2,588 | 5,539 | |
| 1992 | D | 2,657 | 2,432 | 6,029 | |
| 1988 | R | 2,721 | 3,158 | 5,895 | |
| 1984 | R | 2,663 | 3,751 | 6,446 | |
| 1980 | D | 3,181 | 2,926 | 6,287 | |
| 1976 | D | 3,397 | 2,529 | 6,004 | |
| 1972 | R | 2,459 | 3,529 | 6,037 | |
| 1968 | D | 2,772 | 2,661 | 6,570 | |
| 1964 | D | 4,502 | 2,437 | 6,952 | |
| 1960 | R | 3,153 | 4,334 | 7,487 | |
| 1956 | R | 3,572 | 3,880 | 7,490 | |
| 1952 | D | 3,614 | 3,606 | 7,228 | |
| 1948 | D | 3,620 | 2,519 | 6,208 | |
| 1944 | D | 3,810 | 3,256 | 7,105 | |
| 1940 | D | 4,386 | 3,704 | 8,117 | |
| 1936 | D | 4,503 | 3,317 | 7,967 | |
| 1932 | D | 5,065 | 3,213 | 8,334 | |
| 1928 | R | 3,364 | 5,012 | 8,382 | |
| 1924 | D | 3,525 | 3,406 | 7,055 | |
| 1920 | D | 4,691 | 3,743 | 8,476 | |
| 1916 | D | 2,820 | 2,127 | 5,000 | |
| 1912 | D | 2,475 | 1,558 | 4,605 | |
| 1908 | D | 2,675 | 2,136 | 4,911 | |
| 1904 | D | 2,792 | 2,029 | 4,995 | |
| 1900 | D | 2,952 | 2,455 | 5,448 | |
| 1896 | D | 2,698 | 2,575 | 5,347 | |
| 1892 | D | 2,586 | 2,001 | 4,698 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Mason County's Ohio River corridor once split competitive in federal races but recorded an R+43.7 margin in 2024, reflecting the broader rural realignment that has reshaped working-class Kentucky over the past generation.
The Democratic margin in Mason County peaked at thirty points in 1964. By 1996 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-four points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Mason County's median household income of $52,178 sits well below state and national norms, and 19% 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 Breckinridge County and Florence County.