| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 804 | 6,216 | 7,080 | |
| 2020 | R | 918 | 6,179 | 7,171 | |
| 2016 | R | 767 | 5,482 | 6,439 | |
| 2012 | R | 1,086 | 4,904 | 6,091 | |
| 2008 | R | 1,219 | 4,679 | 5,957 | |
| 2004 | R | 1,174 | 5,109 | 6,321 | |
| 2000 | R | 1,122 | 4,284 | 5,469 | |
| 1996 | R | 1,106 | 3,187 | 4,873 | |
| 1992 | R | 1,409 | 3,317 | 5,302 | |
| 1988 | R | 1,216 | 3,857 | 5,117 | |
| 1984 | R | 1,122 | 4,356 | 5,513 | |
| 1980 | R | 1,298 | 4,239 | 5,632 | |
| 1976 | R | 1,602 | 3,379 | 5,032 | |
| 1972 | R | 913 | 3,727 | 4,728 | |
| 1968 | R | 879 | 3,698 | 5,235 | |
| 1964 | R | 1,875 | 3,457 | 5,356 | |
| 1960 | R | 1,413 | 4,811 | 6,224 | |
| 1956 | R | 1,570 | 4,167 | 5,749 | |
| 1952 | R | 1,522 | 3,831 | 5,366 | |
| 1948 | R | 1,495 | 3,380 | 4,911 | |
| 1944 | R | 1,520 | 3,869 | 5,409 | |
| 1940 | R | 1,862 | 3,874 | 5,753 | |
| 1936 | R | 1,925 | 3,588 | 5,534 | |
| 1932 | R | 2,651 | 3,840 | 6,516 | |
| 1928 | R | 1,519 | 3,805 | 5,330 | |
| 1924 | R | 1,797 | 3,120 | 4,950 | |
| 1920 | R | 1,951 | 3,543 | 5,533 | |
| 1916 | R | 1,352 | 1,949 | 3,339 | |
| 1912 | D | 1,158 | 902 | 2,888 | |
| 1908 | R | 1,191 | 1,878 | 3,106 | |
| 1904 | R | 1,133 | 1,595 | 2,794 | |
| 1900 | R | 1,302 | 1,786 | 3,108 | |
| 1896 | R | 1,061 | 1,643 | 2,763 | |
| 1892 | R | 1,039 | 1,223 | 2,359 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Casey County's 2024 presidential margin of R+76.4 places it among the most heavily one-sided counties in the state, reflecting a rural Appalachian-adjacent electorate that has shifted decisively away from its historically Democratic roots over the past two decades.
The Republican margin in Casey County reached its widest at seventy-six points in 2024. The margin in 2024 was seventy-six points, in line with the county's deep historical pattern.
Casey County's loyalty is rooted in its place. Median household income of $45,510, a 95% non-Hispanic-white share, and a population of 15,914 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 Custer County and Logan County.
