| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 10,810 | 14,645 | 26,499 | |
| 2020 | R | 11,421 | 14,105 | 26,364 | |
| 2016 | R | 7,489 | 10,100 | 19,615 | |
| 2012 | R | 7,949 | 9,782 | 18,293 | |
| 2008 | R | 8,030 | 9,471 | 17,868 | |
| 2004 | R | 6,731 | 9,052 | 16,114 | |
| 2000 | R | 5,516 | 7,727 | 14,086 | |
| 1996 | D | 5,707 | 5,224 | 12,564 | |
| 1992 | D | 5,432 | 4,078 | 12,385 | |
| 1988 | D | 5,318 | 5,048 | 10,496 | |
| 1984 | R | 4,830 | 6,580 | 11,531 | |
| 1980 | R | 4,075 | 5,359 | 10,748 | |
| 1976 | D | 4,858 | 4,765 | 10,017 | |
| 1972 | R | 4,299 | 5,464 | 10,126 | |
| 1968 | R | 3,921 | 4,212 | 8,729 | |
| 1964 | D | 5,383 | 3,200 | 8,592 | |
| 1960 | R | 4,303 | 4,640 | 8,953 | |
| 1956 | R | 3,726 | 5,097 | 8,830 | |
| 1952 | R | 3,937 | 5,201 | 9,174 | |
| 1948 | D | 4,588 | 3,446 | 8,348 | |
| 1944 | D | 4,227 | 3,423 | 7,686 | |
| 1940 | D | 5,203 | 3,401 | 8,660 | |
| 1936 | D | 5,044 | 1,941 | 7,218 | |
| 1932 | D | 4,266 | 1,963 | 6,684 | |
| 1928 | R | 2,136 | 3,207 | 5,392 | |
| 1924 | R | 455 | 2,360 | 4,998 | |
| 1920 | R | 1,119 | 2,837 | 5,202 | |
| 1916 | D | 2,609 | 2,310 | 5,281 | |
| 1912 | D | 1,407 | 1,157 | 5,156 | |
| 1908 | R | 985 | 1,752 | 3,116 | |
| 1904 | R | 523 | 1,787 | 2,755 | |
| 1900 | R | 934 | 1,139 | 2,154 | |
| 1896 | D | 1,336 | 1,044 | 2,406 | |
| 1892 | R | 800 | 855 | 2,260 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Kittitas County sits east of the Cascades in Washington's shrubsteppe, where agriculture and outdoor recreation shape the economy. Ellensburg's Central Washington University introduces a younger demographic, but the surrounding rural vote consistently delivers double-digit Republican margins.
The Republican margin in Kittitas County reached its widest at forty-six points in 1904. The margin in 2024 was fourteen points, in line with the county's deep historical pattern.
Kittitas County's loyalty is rooted in its place. Median household income of $73,804, a 82% non-Hispanic-white share, and a population of 47,172 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 Asotin County and Nez Perce County.
