| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 6,073 | 21,011 | 27,412 | |
| 2020 | R | 6,043 | 19,230 | 25,917 | |
| 2016 | R | 4,837 | 15,880 | 21,669 | |
| 2012 | R | 6,018 | 14,724 | 21,090 | |
| 2008 | R | 7,224 | 15,658 | 23,276 | |
| 2004 | R | 8,706 | 14,467 | 23,338 | |
| 2000 | R | 9,575 | 11,345 | 21,326 | |
| 1996 | D | 9,744 | 9,044 | 20,485 | |
| 1992 | D | 9,812 | 8,719 | 20,999 | |
| 1988 | R | 6,535 | 10,881 | 17,497 | |
| 1984 | R | 6,623 | 11,882 | 18,614 | |
| 1980 | R | 6,473 | 11,096 | 18,182 | |
| 1976 | D | 9,216 | 7,121 | 16,491 | |
| 1972 | R | 3,433 | 8,742 | 12,470 | |
| 1968 | R | 3,258 | 6,033 | 13,189 | |
| 1964 | D | 6,108 | 5,735 | 11,843 | |
| 1960 | R | 4,953 | 6,540 | 11,626 | |
| 1956 | R | 4,531 | 6,147 | 10,818 | |
| 1952 | R | 3,702 | 5,583 | 9,285 | |
| 1948 | R | 2,306 | 3,236 | 5,781 | |
| 1944 | R | 1,971 | 2,711 | 4,699 | |
| 1940 | D | 2,384 | 2,245 | 4,650 | |
| 1936 | R | 2,467 | 2,757 | 5,235 | |
| 1932 | R | 1,625 | 2,036 | 3,709 | |
| 1928 | R | 755 | 2,955 | 3,734 | |
| 1924 | R | 795 | 1,635 | 2,577 | |
| 1920 | R | 838 | 1,974 | 2,812 | |
| 1916 | R | 667 | 1,341 | 2,074 | |
| 1912 | D | 570 | 482 | 1,948 | |
| 1908 | R | 595 | 1,524 | 2,268 | |
| 1904 | R | 493 | 1,378 | 2,040 | |
| 1900 | R | 740 | 2,429 | 3,354 | |
| 1896 | R | 821 | 3,026 | 4,003 | |
| 1892 | R | 804 | 1,795 | 3,038 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Once anchored by the federal nuclear research complex at Oak Ridge, Roane County has shifted from competitive territory to one of Tennessee's more lopsided presidential margins, reflecting broader realignment among white working-class voters across Appalachian Tennessee.
The Republican margin in Roane County reached its widest at fifty-nine points in 1928. The margin in 2024 was fifty-four points, in line with the county's deep historical pattern.
Roane County's loyalty is rooted in its place. Median household income of $71,885, a 91% non-Hispanic-white share, and a population of 55,208 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 Dyer County and Fentress County.