| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,764 | 9,739 | 12,723 | |
| 2020 | R | 2,784 | 9,114 | 12,139 | |
| 2016 | R | 2,636 | 8,204 | 11,377 | |
| 2012 | R | 3,909 | 6,533 | 10,737 | |
| 2008 | R | 4,562 | 6,519 | 11,305 | |
| 2004 | R | 3,879 | 6,915 | 10,880 | |
| 2000 | R | 3,675 | 5,868 | 9,801 | |
| 1996 | R | 3,819 | 4,066 | 9,211 | |
| 1992 | D | 4,092 | 4,043 | 10,057 | |
| 1988 | R | 3,370 | 4,998 | 8,416 | |
| 1984 | R | 3,334 | 5,874 | 9,380 | |
| 1980 | R | 3,663 | 5,234 | 9,297 | |
| 1976 | D | 4,409 | 3,794 | 8,318 | |
| 1972 | R | 3,086 | 4,758 | 7,922 | |
| 1968 | R | 2,936 | 3,891 | 8,004 | |
| 1964 | D | 4,943 | 3,598 | 8,573 | |
| 1960 | R | 3,821 | 5,057 | 8,913 | |
| 1956 | R | 3,849 | 4,864 | 8,739 | |
| 1952 | R | 3,844 | 4,849 | 8,745 | |
| 1948 | D | 4,033 | 3,660 | 7,757 | |
| 1944 | R | 3,940 | 4,033 | 8,015 | |
| 1940 | D | 4,471 | 4,216 | 8,716 | |
| 1936 | D | 4,766 | 3,690 | 8,482 | |
| 1932 | D | 4,809 | 3,316 | 8,181 | |
| 1928 | R | 3,518 | 3,835 | 7,381 | |
| 1924 | D | 3,942 | 3,479 | 7,502 | |
| 1920 | D | 4,157 | 3,708 | 7,913 | |
| 1916 | D | 2,414 | 1,871 | 4,371 | |
| 1912 | D | 2,233 | 712 | 4,189 | |
| 1908 | D | 2,573 | 1,976 | 4,641 | |
| 1904 | D | 2,364 | 2,094 | 4,617 | |
| 1900 | D | 2,723 | 2,152 | 4,923 | |
| 1896 | D | 2,613 | 2,214 | 4,864 | |
| 1892 | D | 2,322 | 1,833 | 4,438 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Washington County, anchored by Salem in south-central Indiana, delivered a 54.8-point Republican margin in 2024, reflecting the deep red shift that has reshaped rural communities across the Ohio Valley over the past two decades.
The Republican margin in Washington County reached its widest at fifty-five points in 2024. The margin in 2024 was fifty-five points, in line with the county's deep historical pattern.
Washington County's loyalty is rooted in its place. Median household income of $64,641, a 96% non-Hispanic-white share, and a population of 28,212 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 Harrison County and Brown County.
