| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 14,402 | 23,025 | 38,210 | |
| 2020 | R | 14,505 | 22,654 | 37,976 | |
| 2016 | R | 10,268 | 20,469 | 32,853 | |
| 2012 | R | 9,240 | 20,179 | 29,884 | |
| 2008 | R | 10,000 | 18,997 | 29,316 | |
| 2004 | R | 8,080 | 18,801 | 27,132 | |
| 2000 | R | 6,236 | 13,580 | 20,268 | |
| 1996 | R | 6,202 | 10,477 | 18,301 | |
| 1992 | R | 5,457 | 8,263 | 16,639 | |
| 1988 | R | 4,025 | 8,716 | 12,792 | |
| 1984 | R | 2,857 | 8,112 | 10,991 | |
| 1980 | R | 3,487 | 5,586 | 9,510 | |
| 1976 | R | 2,819 | 3,695 | 6,631 | |
| 1972 | R | 1,311 | 3,041 | 4,472 | |
| 1968 | R | 1,399 | 1,655 | 3,993 | |
| 1964 | D | 2,622 | 1,256 | 3,884 | |
| 1960 | R | 1,960 | 2,221 | 4,181 | |
| 1956 | R | 1,769 | 2,128 | 3,909 | |
| 1952 | D | 1,735 | 1,723 | 3,476 | |
| 1948 | D | 1,703 | 1,036 | 2,829 | |
| 1944 | D | 1,908 | 1,021 | 2,947 | |
| 1940 | D | 1,983 | 848 | 2,841 | |
| 1936 | D | 2,020 | 760 | 2,794 | |
| 1932 | D | 2,319 | 888 | 3,233 | |
| 1928 | R | 1,359 | 1,604 | 2,969 | |
| 1924 | D | 1,954 | 906 | 2,895 | |
| 1920 | D | 2,655 | 1,014 | 3,684 | |
| 1916 | D | 1,455 | 642 | 2,116 | |
| 1912 | D | 1,159 | 261 | 1,754 | |
| 1908 | D | 1,259 | 625 | 1,933 | |
| 1904 | D | 882 | 452 | 1,390 | |
| 1900 | D | 1,062 | 667 | 1,751 | |
| 1896 | D | 946 | 691 | 1,707 | |
| 1892 | D | 783 | 365 | 1,250 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Oldham County's rapid residential growth along the Louisville metro fringe has not diluted its Republican lean — the 2024 presidential margin held above 22 points despite an influx of suburban commuters.
The Republican margin in Oldham County reached its widest at forty-eight points in 1984. The margin in 2024 was twenty-three points, in line with the county's deep historical pattern.
Oldham County's loyalty is rooted in its place. Median household income of $122,497, a 87% non-Hispanic-white share, and a population of 69,257 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 Cherokee County and Cleveland County.
