| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 329 | 2,436 | 2,806 | |
| 2020 | R | 369 | 2,595 | 3,008 | |
| 2016 | R | 296 | 2,299 | 2,733 | |
| 2012 | R | 468 | 2,076 | 2,591 | |
| 2008 | R | 529 | 1,949 | 2,513 | |
| 2004 | R | 455 | 2,050 | 2,530 | |
| 2000 | R | 477 | 1,878 | 2,445 | |
| 1996 | R | 649 | 1,566 | 2,440 | |
| 1992 | R | 660 | 1,266 | 2,613 | |
| 1988 | R | 958 | 1,707 | 2,715 | |
| 1984 | R | 568 | 2,080 | 2,684 | |
| 1980 | R | 568 | 2,007 | 2,811 | |
| 1976 | R | 1,211 | 1,440 | 2,736 | |
| 1972 | R | 643 | 1,837 | 2,629 | |
| 1968 | R | 694 | 1,634 | 2,682 | |
| 1964 | R | 1,341 | 1,434 | 2,779 | |
| 1960 | R | 1,039 | 1,979 | 3,022 | |
| 1956 | R | 1,067 | 2,020 | 3,098 | |
| 1952 | R | 1,009 | 2,398 | 3,443 | |
| 1948 | R | 1,304 | 1,636 | 2,958 | |
| 1944 | R | 1,058 | 2,259 | 3,328 | |
| 1940 | R | 1,403 | 2,390 | 3,816 | |
| 1936 | D | 2,071 | 1,723 | 3,886 | |
| 1932 | D | 2,378 | 1,385 | 3,913 | |
| 1928 | R | 851 | 2,132 | 3,046 | |
| 1924 | R | 720 | 1,851 | 3,411 | |
| 1920 | R | 1,060 | 2,117 | 3,337 | |
| 1916 | D | 1,748 | 989 | 2,898 | |
| 1912 | D | 765 | 361 | 1,968 | |
| 1908 | R | 424 | 599 | 1,049 | |
| 1904 | R | 191 | 460 | 692 | |
| 1900 | R | 191 | 312 | 522 | |
| 1896 | R | 177 | 222 | 413 | |
| 1892 | R | 0 | 250 | 397 | |
| 1888 | R | 505 | 810 | 1,370 | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
A sparsely populated high-plains ranching county on Colorado's eastern edge, Washington recorded a 75-point Republican presidential margin in 2024 — among the widest in the state and consistent with its long-running pattern of single-party dominance.
The Republican margin in Washington County reached its widest at seventy-five points in 2024. The margin in 2024 was seventy-five points, in line with the county's deep historical pattern.
Washington County's loyalty is rooted in its place. Median household income of $67,167, a 87% non-Hispanic-white share, and a population of 4,831 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 Cheyenne County and Harlan County.
