| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 15,076 | 10,262 | 25,893 | |
| 2020 | D | 15,110 | 9,982 | 26,032 | |
| 2016 | D | 12,443 | 9,148 | 23,147 | |
| 2012 | D | 13,223 | 8,248 | 22,067 | |
| 2008 | D | 13,728 | 8,816 | 22,980 | |
| 2004 | D | 12,690 | 10,103 | 23,247 | |
| 2000 | D | 9,453 | 8,968 | 20,501 | |
| 1996 | D | 8,839 | 6,192 | 18,883 | |
| 1992 | D | 7,631 | 6,310 | 20,338 | |
| 1988 | R | 7,343 | 10,156 | 17,650 | |
| 1984 | R | 6,024 | 11,311 | 17,401 | |
| 1980 | R | 5,732 | 7,631 | 15,581 | |
| 1976 | R | 5,922 | 8,315 | 14,786 | |
| 1972 | R | 3,601 | 8,478 | 12,079 | |
| 1968 | R | 5,119 | 6,585 | 11,918 | |
| 1964 | D | 7,022 | 4,404 | 11,430 | |
| 1960 | R | 3,816 | 9,083 | 12,900 | |
| 1956 | R | 2,037 | 8,866 | 10,903 | |
| 1952 | R | 2,414 | 8,793 | 11,227 | |
| 1948 | R | 1,924 | 5,374 | 7,395 | |
| 1944 | R | 3,758 | 5,590 | 9,363 | |
| 1940 | R | 4,197 | 6,530 | 10,747 | |
| 1936 | R | 3,991 | 6,567 | 10,879 | |
| 1932 | R | 4,765 | 6,169 | 11,159 | |
| 1928 | R | 2,332 | 6,660 | 9,080 | |
| 1924 | R | 1,770 | 4,919 | 7,028 | |
| 1920 | R | 2,971 | 4,979 | 8,183 | |
| 1916 | D | 3,434 | 2,211 | 5,846 | |
| 1912 | D | 2,751 | 1,097 | 5,499 | |
| 1908 | R | 1,932 | 2,228 | 4,452 | |
| 1904 | R | 1,866 | 2,538 | 4,633 | |
| 1900 | D | 2,765 | 2,762 | 5,665 | |
| 1896 | R | 1,900 | 3,286 | 5,324 | |
| 1892 | R | 2,136 | 2,321 | 5,021 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Knox County's rugged Penobscot Bay coastline anchors an economy split between tourism, fishing, and the arts, drawing a mix of longtime residents and transplants whose combined preferences have produced consistent Democratic margins well above the national average.
The Democratic margin in Knox County reached its widest at thirty points in 1912. The margin in 2024 was nineteen points — still decisive.
Knox County's loyalty is rooted in its place. Median household income of $74,096, a 94% non-Hispanic-white share, and a population of 41,003 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Ulster County and Grafton County.
