| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 394 | 2,220 | 2,655 | |
| 2020 | R | 475 | 2,363 | 2,883 | |
| 2016 | R | 387 | 2,194 | 2,765 | |
| 2012 | R | 524 | 2,316 | 2,889 | |
| 2008 | R | 659 | 2,248 | 2,980 | |
| 2004 | R | 643 | 2,498 | 3,190 | |
| 2000 | R | 687 | 2,446 | 3,267 | |
| 1996 | R | 804 | 2,397 | 3,557 | |
| 1992 | R | 893 | 1,740 | 3,702 | |
| 1988 | R | 1,063 | 2,269 | 3,380 | |
| 1984 | R | 889 | 2,979 | 3,936 | |
| 1980 | R | 784 | 3,058 | 4,083 | |
| 1976 | R | 1,564 | 2,543 | 4,213 | |
| 1972 | R | 996 | 3,301 | 4,394 | |
| 1968 | R | 1,131 | 3,177 | 4,652 | |
| 1964 | R | 2,015 | 2,654 | 4,705 | |
| 1960 | R | 1,706 | 3,707 | 5,444 | |
| 1956 | R | 1,389 | 4,220 | 5,641 | |
| 1952 | R | 1,148 | 5,135 | 6,309 | |
| 1948 | R | 1,894 | 3,894 | 5,883 | |
| 1944 | R | 1,455 | 5,040 | 6,536 | |
| 1940 | R | 2,061 | 5,792 | 7,903 | |
| 1936 | R | 3,355 | 4,809 | 8,192 | |
| 1932 | D | 4,234 | 3,324 | 7,653 | |
| 1928 | R | 2,267 | 4,781 | 7,097 | |
| 1924 | R | 1,528 | 4,120 | 6,756 | |
| 1920 | R | 1,287 | 4,390 | 5,772 | |
| 1916 | R | 3,316 | 3,766 | 7,282 | |
| 1912 | D | 1,914 | 1,326 | 4,667 | |
| 1908 | R | 1,904 | 2,711 | 4,714 | |
| 1904 | R | 1,259 | 3,066 | 4,500 | |
| 1900 | R | 2,252 | 2,960 | 5,284 | |
| 1896 | R | 2,391 | 2,514 | 4,962 | |
| 1892 | R | 0 | 2,842 | 5,185 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Washington County, anchored by the small city of Washington on the rolling plains of north-central Kansas, delivered a 69-point Republican presidential margin in 2024, reflecting the deep rural realignment that has reshaped Great Plains counties over the past two decades.
The Republican margin in Washington County reached its widest at sixty-nine points in 2024. The margin in 2024 was sixty-nine points, in line with the county's deep historical pattern.
Washington County's loyalty is rooted in its place. Median household income of $65,482, a 92% non-Hispanic-white share, and a population of 5,533 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 Chase County and Jewell County.
