| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 13,106 | 15,476 | 29,568 | |
| 2020 | R | 13,690 | 16,400 | 31,261 | |
| 2016 | R | 9,694 | 13,651 | 26,228 | |
| 2012 | R | 9,768 | 14,648 | 25,298 | |
| 2008 | R | 10,081 | 14,182 | 24,727 | |
| 2004 | R | 8,257 | 14,323 | 22,925 | |
| 2000 | R | 7,188 | 13,304 | 21,365 | |
| 1996 | R | 8,038 | 9,085 | 19,486 | |
| 1992 | R | 7,325 | 7,894 | 19,881 | |
| 1988 | R | 7,448 | 9,683 | 17,403 | |
| 1984 | R | 6,804 | 12,361 | 19,398 | |
| 1980 | R | 5,825 | 11,223 | 18,977 | |
| 1976 | R | 7,012 | 10,883 | 18,400 | |
| 1972 | R | 5,364 | 12,579 | 18,533 | |
| 1968 | R | 5,841 | 10,042 | 16,923 | |
| 1964 | D | 9,481 | 8,102 | 17,594 | |
| 1960 | R | 6,721 | 11,786 | 18,519 | |
| 1956 | R | 6,076 | 11,827 | 17,910 | |
| 1952 | R | 5,738 | 11,987 | 17,817 | |
| 1948 | R | 7,102 | 7,993 | 15,378 | |
| 1944 | R | 5,793 | 7,364 | 13,235 | |
| 1940 | R | 5,875 | 7,883 | 13,821 | |
| 1936 | D | 6,562 | 4,584 | 11,670 | |
| 1932 | D | 5,578 | 4,653 | 10,575 | |
| 1928 | R | 2,859 | 6,774 | 9,666 | |
| 1924 | R | 1,662 | 5,465 | 9,290 | |
| 1920 | R | 2,338 | 5,957 | 8,812 | |
| 1916 | D | 4,456 | 4,429 | 9,227 | |
| 1912 | D | 2,507 | 1,937 | 7,663 | |
| 1908 | R | 1,660 | 2,843 | 4,681 | |
| 1904 | R | 956 | 2,824 | 3,923 | |
| 1900 | R | 1,480 | 2,119 | 3,689 | |
| 1896 | D | 1,716 | 1,596 | 3,351 | |
| 1892 | R | 1,313 | 1,362 | 2,889 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Walla Walla's mix of irrigated farmland, a state prison, and a growing wine tourism economy produces a county that leans Republican but runs closer in local races than its rural neighbors.
The Republican margin in Walla Walla County reached its widest at forty-eight points in 1904. The margin in 2024 was eight points, in line with the county's deep historical pattern.
Walla Walla County's loyalty is rooted in its place. Median household income of $74,202, a 73% non-Hispanic-white share, and a population of 62,161 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 Carver County and Jeff Davis County.
