| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 5,395 | 12,965 | 18,567 | |
| 2020 | R | 5,502 | 11,902 | 17,625 | |
| 2016 | R | 4,744 | 10,022 | 15,505 | |
| 2012 | R | 5,734 | 7,303 | 13,311 | |
| 2008 | R | 7,097 | 7,504 | 14,791 | |
| 2004 | R | 5,823 | 8,035 | 13,967 | |
| 2000 | R | 5,521 | 6,064 | 11,994 | |
| 1996 | D | 5,658 | 4,293 | 11,483 | |
| 1992 | D | 5,397 | 4,471 | 12,569 | |
| 1988 | D | 5,759 | 5,735 | 11,613 | |
| 1984 | R | 4,525 | 6,678 | 11,273 | |
| 1980 | R | 4,842 | 6,288 | 12,010 | |
| 1976 | D | 6,532 | 5,858 | 12,564 | |
| 1972 | R | 4,772 | 8,205 | 13,119 | |
| 1968 | R | 6,301 | 6,563 | 13,508 | |
| 1964 | D | 10,038 | 4,298 | 14,372 | |
| 1960 | R | 5,965 | 9,184 | 15,161 | |
| 1956 | R | 5,411 | 8,250 | 13,678 | |
| 1952 | R | 5,758 | 8,125 | 13,938 | |
| 1948 | R | 5,013 | 5,618 | 10,631 | |
| 1944 | R | 5,703 | 5,915 | 11,675 | |
| 1940 | D | 7,419 | 6,291 | 13,736 | |
| 1936 | D | 8,351 | 6,479 | 14,969 | |
| 1932 | R | 3,741 | 4,851 | 8,894 | |
| 1928 | R | 2,849 | 8,120 | 11,029 | |
| 1924 | R | 1,939 | 5,129 | 9,391 | |
| 1920 | R | 2,976 | 4,303 | 7,884 | |
| 1916 | D | 2,967 | 2,794 | 6,190 | |
| 1912 | D | 2,200 | 1,214 | 6,035 | |
| 1908 | R | 2,547 | 3,477 | 6,375 | |
| 1904 | R | 1,941 | 3,535 | 5,761 | |
| 1900 | R | 2,879 | 3,157 | 6,241 | |
| 1896 | R | 3,053 | 3,486 | 6,804 | |
| 1892 | D | 3,075 | 2,572 | 5,858 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Clinton County's population of under 40,000 is concentrated along the West Branch Susquehanna River, and its presidential margins have swung from competitive to R+40.9 over the past two decades—one of the steeper realignment arcs in the state.
The Democratic margin in Clinton County peaked at forty points in 1964. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-one points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Clinton County's median household income of $60,816 sits well below state and national norms, and 15% 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 Sullivan County and Linn County.