| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 5,793 | 16,836 | 23,174 | |
| 2020 | R | 5,790 | 17,076 | 23,501 | |
| 2016 | R | 5,048 | 15,825 | 22,224 | |
| 2012 | R | 5,532 | 15,668 | 21,200 | |
| 2008 | R | 6,308 | 16,457 | 22,765 | |
| 2004 | R | 6,862 | 16,551 | 23,413 | |
| 2000 | R | 6,644 | 13,788 | 20,744 | |
| 1996 | R | 6,732 | 11,605 | 20,694 | |
| 1992 | R | 6,593 | 11,342 | 23,663 | |
| 1988 | R | 6,971 | 14,613 | 21,713 | |
| 1984 | R | 5,476 | 19,043 | 24,667 | |
| 1980 | R | 5,854 | 16,563 | 23,503 | |
| 1976 | R | 6,898 | 14,560 | 21,670 | |
| 1972 | R | 3,658 | 16,347 | 20,500 | |
| 1968 | R | 4,641 | 12,812 | 20,544 | |
| 1964 | R | 8,571 | 12,382 | 20,953 | |
| 1960 | R | 5,479 | 13,700 | 19,179 | |
| 1956 | R | 5,529 | 12,488 | 18,017 | |
| 1952 | R | 6,238 | 11,334 | 17,572 | |
| 1948 | R | 5,508 | 6,036 | 11,544 | |
| 1944 | R | 5,090 | 6,533 | 11,641 | |
| 1940 | R | 6,289 | 7,347 | 13,676 | |
| 1936 | D | 6,202 | 5,201 | 11,429 | |
| 1932 | D | 6,863 | 4,713 | 11,576 | |
| 1928 | R | 2,563 | 7,258 | 9,877 | |
| 1924 | R | 3,487 | 4,579 | 8,300 | |
| 1920 | R | 2,805 | 4,105 | 7,099 | |
| 1916 | D | 1,839 | 1,727 | 3,925 | |
| 1912 | D | 1,561 | 1,477 | 3,385 | |
| 1908 | R | 1,409 | 1,528 | 3,067 | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Washington County, anchored by Bartlesville, has delivered Republican presidential margins above 40 points in recent cycles, reflecting the deep-red political alignment common to northeastern Oklahoma's smaller metropolitan areas.
The Republican margin in Washington County reached its widest at sixty-two points in 1972. The margin in 2024 was forty-eight points, in line with the county's deep historical pattern.
Washington County's loyalty is rooted in its place. Median household income of $60,162, a 72% non-Hispanic-white share, and a population of 53,326 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 Bradley County and Pulaski County.
