| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 5,917 | 7,178 | 13,610 | |
| 2020 | R | 5,959 | 7,237 | 13,560 | |
| 2016 | R | 4,194 | 5,789 | 11,074 | |
| 2012 | R | 4,598 | 5,316 | 10,391 | |
| 2008 | D | 4,965 | 4,944 | 10,164 | |
| 2004 | R | 4,036 | 5,016 | 9,250 | |
| 2000 | R | 3,062 | 4,557 | 8,181 | |
| 1996 | D | 3,214 | 2,662 | 7,065 | |
| 1992 | D | 2,758 | 2,085 | 6,849 | |
| 1988 | D | 2,991 | 2,920 | 6,086 | |
| 1984 | R | 2,712 | 3,910 | 6,757 | |
| 1980 | R | 2,596 | 3,113 | 6,284 | |
| 1976 | D | 2,890 | 2,573 | 5,719 | |
| 1972 | R | 2,293 | 3,061 | 5,648 | |
| 1968 | D | 2,454 | 2,355 | 5,173 | |
| 1964 | D | 3,819 | 1,850 | 5,674 | |
| 1960 | R | 2,744 | 2,836 | 5,595 | |
| 1956 | R | 2,577 | 2,794 | 5,379 | |
| 1952 | R | 2,140 | 2,845 | 5,011 | |
| 1948 | D | 2,206 | 1,951 | 4,252 | |
| 1944 | D | 2,089 | 1,980 | 4,127 | |
| 1940 | D | 2,627 | 2,139 | 4,794 | |
| 1936 | D | 2,545 | 1,190 | 3,898 | |
| 1932 | D | 2,155 | 1,335 | 3,643 | |
| 1928 | R | 975 | 1,936 | 2,959 | |
| 1924 | R | 518 | 1,482 | 2,811 | |
| 1920 | R | 745 | 1,649 | 2,777 | |
| 1916 | R | 1,478 | 1,570 | 3,259 | |
| 1912 | R | 1,028 | 1,163 | 3,459 | |
| 1908 | R | 570 | 1,245 | 2,037 | |
| 1904 | R | 362 | 1,370 | 1,939 | |
| 1900 | R | 495 | 906 | 1,485 | |
| 1896 | R | 708 | 876 | 1,595 | |
| 1892 | R | 279 | 616 | 1,310 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Klickitat's economy of ranching, orchards, and logging has kept it reliably center-right, and its 2024 presidential margin of R+9.3 reflects a rural Eastern Washington pattern even as renewable-energy development quietly diversifies the local base.
The county's recent history is a story of close margins. The Democratic margin reached thirty-five points in 1936; the Republican margin reached fifty-two points in 1904. Most other elections have been decided by single-digit points.
Klickitat County's demographics — a population of 23,411, a 82% non-Hispanic-white share, a median household income of $71,042 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Spokane County and Kittitas County.