| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,432 | 9,630 | 11,130 | |
| 2020 | R | 1,467 | 8,565 | 10,134 | |
| 2016 | R | 1,154 | 6,626 | 8,008 | |
| 2012 | R | 1,668 | 5,470 | 7,252 | |
| 2008 | R | 2,066 | 5,297 | 7,503 | |
| 2004 | R | 2,569 | 4,907 | 7,527 | |
| 2000 | R | 2,361 | 3,746 | 6,194 | |
| 1996 | R | 2,162 | 2,875 | 5,453 | |
| 1992 | R | 2,242 | 2,772 | 5,553 | |
| 1988 | R | 1,423 | 2,734 | 4,174 | |
| 1984 | R | 1,565 | 3,212 | 4,814 | |
| 1980 | R | 1,495 | 3,254 | 4,848 | |
| 1976 | R | 2,018 | 2,805 | 4,863 | |
| 1972 | R | 828 | 2,842 | 3,713 | |
| 1968 | R | 761 | 2,788 | 4,145 | |
| 1964 | R | 1,309 | 2,634 | 3,943 | |
| 1960 | R | 939 | 3,017 | 3,977 | |
| 1956 | R | 913 | 2,497 | 3,449 | |
| 1952 | R | 937 | 3,030 | 3,972 | |
| 1948 | R | 644 | 1,824 | 2,542 | |
| 1944 | R | 605 | 1,938 | 2,550 | |
| 1940 | R | 842 | 1,688 | 2,557 | |
| 1936 | R | 1,153 | 1,754 | 2,916 | |
| 1932 | R | 995 | 1,325 | 2,353 | |
| 1928 | R | 466 | 1,457 | 1,935 | |
| 1924 | R | 651 | 1,464 | 2,128 | |
| 1920 | R | 895 | 2,158 | 3,054 | |
| 1916 | R | 843 | 1,529 | 2,375 | |
| 1912 | D | 841 | 741 | 2,482 | |
| 1908 | R | 673 | 1,309 | 1,993 | |
| 1904 | R | 592 | 1,253 | 1,859 | |
| 1900 | R | 960 | 1,802 | 2,768 | |
| 1896 | R | 1,002 | 1,863 | 2,870 | |
| 1892 | R | 882 | 1,342 | 2,379 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Grainger County, tucked in the Ridge and Valley terrain of northeastern Tennessee, recorded an R+73.7 presidential margin in 2024 — among the widest in the state — reflecting a rural, overwhelmingly white electorate with deep roots in small-scale agriculture.
The Republican margin in Grainger County reached its widest at seventy-four points in 2024. The margin in 2024 was seventy-four points, in line with the county's deep historical pattern.
Grainger County's loyalty is rooted in its place. Median household income of $50,538, a 96% non-Hispanic-white share, and a population of 24,266 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 Hawkins County and McMinn County.