| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,415 | 8,927 | 11,480 | |
| 2020 | R | 2,530 | 8,737 | 11,433 | |
| 2016 | R | 1,921 | 7,196 | 9,515 | |
| 2012 | R | 2,549 | 5,726 | 8,431 | |
| 2008 | R | 2,519 | 5,378 | 8,049 | |
| 2004 | R | 1,970 | 4,816 | 6,822 | |
| 2000 | R | 1,554 | 3,150 | 4,772 | |
| 1996 | R | 1,404 | 1,614 | 3,368 | |
| 1992 | D | 1,383 | 1,305 | 3,167 | |
| 1988 | R | 1,121 | 1,368 | 2,505 | |
| 1984 | R | 910 | 1,456 | 2,372 | |
| 1980 | D | 1,216 | 935 | 2,200 | |
| 1976 | D | 1,209 | 742 | 1,983 | |
| 1972 | R | 481 | 1,120 | 1,629 | |
| 1968 | R | 564 | 733 | 1,750 | |
| 1964 | D | 1,422 | 525 | 1,954 | |
| 1960 | R | 1,048 | 1,134 | 2,182 | |
| 1956 | D | 1,214 | 896 | 2,117 | |
| 1952 | D | 1,283 | 723 | 2,007 | |
| 1948 | D | 1,298 | 493 | 1,812 | |
| 1944 | D | 1,443 | 646 | 2,096 | |
| 1940 | D | 1,728 | 567 | 2,300 | |
| 1936 | D | 1,647 | 638 | 2,294 | |
| 1932 | D | 1,773 | 736 | 2,515 | |
| 1928 | R | 947 | 1,565 | 2,516 | |
| 1924 | D | 1,320 | 961 | 2,291 | |
| 1920 | D | 2,135 | 1,102 | 3,253 | |
| 1916 | D | 1,271 | 591 | 1,869 | |
| 1912 | D | 1,052 | 271 | 1,585 | |
| 1908 | D | 1,175 | 563 | 1,761 | |
| 1904 | D | 1,024 | 529 | 1,582 | |
| 1900 | D | 1,174 | 582 | 1,762 | |
| 1896 | D | 969 | 596 | 1,601 | |
| 1892 | D | 848 | 316 | 1,242 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Spencer County's 2024 presidential margin of R+56.7 places it among Kentucky's most lopsided rural counties, a pattern consistent with the broader shift of small Bluegrass communities toward overwhelming Republican alignment over the past two decades.
The unraveling was not abrupt. The Democratic margin in Spencer County peaked at fifty points in 1940; it narrowed steadily over the late twentieth century. The 1996 election delivered the county to the Republican party for the first time in many years, by a margin of six points. By 2024, the margin had widened further.
The economic and demographic context is severe. Spencer County's median household income of $102,618 is among the lowest of any county in the United States; 10% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Barren County and Larue County.
