| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 20,601 | 45,650 | 67,421 | |
| 2020 | R | 20,901 | 44,814 | 66,998 | |
| 2016 | R | 15,026 | 39,082 | 57,618 | |
| 2012 | R | 15,629 | 35,922 | 52,511 | |
| 2008 | R | 16,292 | 33,812 | 50,774 | |
| 2004 | R | 12,391 | 32,329 | 45,082 | |
| 2000 | R | 9,248 | 22,016 | 31,984 | |
| 1996 | R | 8,379 | 15,085 | 25,607 | |
| 1992 | R | 6,514 | 12,306 | 23,575 | |
| 1988 | R | 5,382 | 12,667 | 18,157 | |
| 1984 | R | 4,853 | 12,690 | 17,649 | |
| 1980 | R | 5,374 | 8,263 | 14,148 | |
| 1976 | D | 5,602 | 5,602 | 11,385 | |
| 1972 | R | 2,595 | 7,355 | 10,280 | |
| 1968 | R | 2,725 | 4,081 | 9,051 | |
| 1964 | D | 5,077 | 3,430 | 8,522 | |
| 1960 | R | 2,965 | 4,835 | 7,800 | |
| 1956 | R | 2,933 | 3,139 | 6,090 | |
| 1952 | D | 2,620 | 2,309 | 4,946 | |
| 1948 | D | 2,320 | 1,151 | 3,523 | |
| 1944 | D | 2,451 | 1,457 | 3,921 | |
| 1940 | D | 2,518 | 1,357 | 3,888 | |
| 1936 | D | 2,785 | 1,042 | 3,915 | |
| 1932 | D | 3,536 | 1,355 | 4,923 | |
| 1928 | R | 1,855 | 2,604 | 4,466 | |
| 1924 | D | 2,204 | 1,340 | 3,682 | |
| 1920 | D | 3,472 | 973 | 4,480 | |
| 1916 | D | 2,008 | 531 | 2,548 | |
| 1912 | D | 1,738 | 371 | 2,283 | |
| 1908 | D | 2,041 | 631 | 2,709 | |
| 1904 | D | 2,013 | 578 | 2,629 | |
| 1900 | D | 2,302 | 759 | 3,074 | |
| 1896 | D | 2,317 | 781 | 3,146 | |
| 1892 | D | 2,009 | 545 | 2,596 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Boone County sits in the Cincinnati metro's Kentucky fringe, where rapid suburban growth since the 1990s has accompanied consistently lopsided Republican presidential margins — R+37.1 in 2024 among the largest in the state.
The Republican margin in Boone County reached its widest at forty-six points in 1972. The margin in 2024 was thirty-seven points, in line with the county's deep historical pattern.
Boone County's loyalty is rooted in its place. Median household income of $99,414, a 83% non-Hispanic-white share, and a population of 139,841 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 Clermont County and Powhatan County.
