| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 8,821 | 10,569 | 19,458 | |
| 2020 | R | 9,253 | 9,668 | 19,268 | |
| 2016 | R | 7,297 | 8,221 | 16,952 | |
| 2012 | D | 9,894 | 5,740 | 15,934 | |
| 2008 | D | 10,571 | 6,676 | 17,520 | |
| 2004 | D | 9,543 | 8,383 | 18,316 | |
| 2000 | D | 8,870 | 7,643 | 17,451 | |
| 1996 | D | 8,494 | 5,072 | 16,394 | |
| 1992 | D | 7,654 | 6,635 | 18,365 | |
| 1988 | R | 7,928 | 9,135 | 17,192 | |
| 1984 | R | 6,400 | 10,617 | 17,064 | |
| 1980 | R | 7,281 | 7,620 | 16,292 | |
| 1976 | R | 7,248 | 8,846 | 16,152 | |
| 1972 | R | 5,266 | 10,959 | 16,260 | |
| 1968 | R | 6,678 | 8,314 | 15,602 | |
| 1964 | D | 12,467 | 4,846 | 17,329 | |
| 1960 | D | 9,946 | 9,385 | 19,358 | |
| 1956 | R | 5,226 | 13,003 | 18,229 | |
| 1952 | R | 6,591 | 12,212 | 18,828 | |
| 1948 | R | 6,799 | 8,993 | 16,302 | |
| 1944 | R | 8,060 | 9,225 | 17,324 | |
| 1940 | R | 9,479 | 11,446 | 20,958 | |
| 1936 | R | 8,799 | 11,521 | 20,478 | |
| 1932 | D | 10,318 | 9,422 | 19,857 | |
| 1928 | D | 9,501 | 9,495 | 19,045 | |
| 1924 | R | 4,364 | 9,352 | 14,515 | |
| 1920 | R | 3,825 | 9,786 | 13,865 | |
| 1916 | R | 3,593 | 5,146 | 8,936 | |
| 1912 | R | 2,711 | 3,930 | 8,393 | |
| 1908 | R | 2,935 | 5,999 | 9,355 | |
| 1904 | R | 2,869 | 6,699 | 9,910 | |
| 1900 | R | 2,666 | 6,313 | 9,217 | |
| 1896 | R | 2,490 | 6,118 | 8,829 | |
| 1892 | R | 2,999 | 5,498 | 8,840 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Franklin County's St. Regis Mohawk Reservation adds a distinctive demographic layer to its otherwise sparsely populated North Country electorate, contributing to voting patterns that diverge from neighboring counties of similar size and density.
The county's recent history is a story of close margins. The Democratic margin reached forty-four points in 1964; the Republican margin reached forty-three points in 1920. Most other elections have been decided by single-digit points.
Franklin County's demographics — a population of 46,696, a 84% non-Hispanic-white share, a median household income of $65,151 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Winona County and Franklin County.
