| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,838 | 8,826 | 11,851 | |
| 2020 | R | 3,033 | 8,506 | 11,735 | |
| 2016 | R | 2,395 | 7,740 | 10,585 | |
| 2012 | R | 2,966 | 6,820 | 9,939 | |
| 2008 | R | 3,159 | 6,781 | 10,060 | |
| 2004 | R | 3,224 | 6,745 | 10,028 | |
| 2000 | R | 3,092 | 5,362 | 8,632 | |
| 1996 | R | 3,179 | 3,264 | 7,282 | |
| 1992 | R | 3,010 | 3,211 | 7,653 | |
| 1988 | R | 2,832 | 3,904 | 6,843 | |
| 1984 | R | 2,516 | 4,592 | 7,189 | |
| 1980 | D | 3,528 | 3,275 | 6,970 | |
| 1976 | D | 3,411 | 2,451 | 5,991 | |
| 1972 | R | 1,707 | 3,575 | 5,410 | |
| 1968 | R | 1,950 | 2,432 | 5,646 | |
| 1964 | D | 3,564 | 1,732 | 5,317 | |
| 1960 | R | 2,713 | 3,569 | 6,282 | |
| 1956 | R | 2,767 | 3,168 | 5,952 | |
| 1952 | D | 2,740 | 2,545 | 5,312 | |
| 1948 | D | 2,682 | 1,599 | 4,363 | |
| 1944 | D | 3,086 | 2,039 | 5,146 | |
| 1940 | D | 3,606 | 1,845 | 5,470 | |
| 1936 | D | 3,659 | 2,161 | 5,846 | |
| 1932 | D | 3,759 | 1,950 | 5,745 | |
| 1928 | R | 2,140 | 3,462 | 5,606 | |
| 1924 | R | 2,698 | 2,715 | 5,472 | |
| 1920 | D | 3,623 | 2,786 | 6,442 | |
| 1916 | D | 2,093 | 1,531 | 3,659 | |
| 1912 | D | 1,792 | 889 | 3,292 | |
| 1908 | D | 1,747 | 1,567 | 3,406 | |
| 1904 | D | 1,703 | 1,494 | 3,290 | |
| 1900 | D | 1,784 | 1,775 | 3,630 | |
| 1896 | R | 1,745 | 1,765 | 3,652 | |
| 1892 | D | 1,562 | 1,185 | 2,962 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Mercer County sits in Kentucky's Inner Bluegrass region and has delivered Republican presidential margins exceeding 50 points, reflecting a rural demographic shift that accelerated through the 2010s and has yet to show signs of reversal.
The Republican margin in Mercer County reached its widest at fifty-one points in 2024. The margin in 2024 was fifty-one points, in line with the county's deep historical pattern.
Mercer County's loyalty is rooted in its place. Median household income of $64,824, a 90% non-Hispanic-white share, and a population of 23,028 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 Anderson County and Jeff Davis County.
