| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 147 | 1,284 | 1,451 | |
| 2020 | R | 136 | 1,327 | 1,487 | |
| 2016 | R | 134 | 1,318 | 1,499 | |
| 2012 | R | 173 | 1,261 | 1,434 | |
| 2008 | R | 221 | 1,342 | 1,563 | |
| 2004 | R | 268 | 1,397 | 1,665 | |
| 2000 | R | 374 | 1,296 | 1,683 | |
| 1996 | R | 511 | 1,036 | 1,778 | |
| 1992 | R | 486 | 1,038 | 2,035 | |
| 1988 | R | 593 | 1,281 | 1,900 | |
| 1984 | R | 373 | 1,748 | 2,146 | |
| 1980 | R | 517 | 1,652 | 2,230 | |
| 1976 | R | 978 | 1,303 | 2,320 | |
| 1972 | R | 385 | 1,976 | 2,475 | |
| 1968 | R | 518 | 1,483 | 2,354 | |
| 1964 | R | 1,240 | 1,379 | 2,619 | |
| 1960 | R | 744 | 2,057 | 2,801 | |
| 1956 | R | 736 | 1,596 | 2,332 | |
| 1952 | R | 736 | 2,057 | 2,793 | |
| 1948 | D | 1,281 | 1,221 | 2,502 | |
| 1944 | R | 1,056 | 1,394 | 2,473 | |
| 1940 | R | 1,419 | 1,616 | 3,073 | |
| 1936 | D | 1,836 | 1,068 | 2,911 | |
| 1932 | D | 2,139 | 783 | 2,922 | |
| 1928 | R | 872 | 1,844 | 2,775 | |
| 1924 | R | 824 | 1,226 | 2,415 | |
| 1920 | R | 753 | 1,404 | 2,339 | |
| 1916 | D | 798 | 662 | 1,887 | |
| 1912 | R | 523 | 679 | 1,500 | |
| 1908 | R | 746 | 876 | 1,829 | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Harper County, anchored by the small ranching town of Buffalo, sits in Oklahoma's northwestern panhandle-adjacent plains and recorded an R+78.4 presidential margin in 2024, making it among the most skewed results in the state.
The Republican margin in Harper County reached its widest at eighty points in 2020. The margin in 2024 was seventy-eight points, in line with the county's deep historical pattern.
Harper County's loyalty is rooted in its place. Median household income of $64,053, a 73% non-Hispanic-white share, and a population of 3,203 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 Woodward County and Alfalfa County.
