| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 42,582 | 31,245 | 76,027 | |
| 2020 | D | 44,549 | 29,818 | 76,060 | |
| 2016 | D | 33,741 | 27,230 | 66,369 | |
| 2012 | D | 35,888 | 25,366 | 62,879 | |
| 2008 | D | 39,082 | 25,624 | 66,160 | |
| 2004 | D | 34,679 | 26,533 | 62,634 | |
| 2000 | D | 29,560 | 21,253 | 56,224 | |
| 1996 | D | 25,958 | 16,302 | 49,832 | |
| 1992 | D | 23,009 | 16,211 | 52,944 | |
| 1988 | D | 23,210 | 21,650 | 45,062 | |
| 1984 | R | 17,793 | 24,365 | 42,305 | |
| 1980 | R | 16,429 | 16,932 | 40,827 | |
| 1976 | D | 17,980 | 17,856 | 36,022 | |
| 1972 | R | 13,637 | 19,280 | 32,979 | |
| 1968 | D | 13,851 | 11,639 | 26,818 | |
| 1964 | D | 17,434 | 7,342 | 24,776 | |
| 1960 | R | 11,580 | 12,651 | 24,231 | |
| 1956 | R | 7,450 | 14,278 | 21,728 | |
| 1952 | R | 8,448 | 13,389 | 21,846 | |
| 1948 | R | 7,379 | 9,522 | 17,041 | |
| 1944 | R | 6,419 | 8,233 | 14,670 | |
| 1940 | R | 6,001 | 9,233 | 15,251 | |
| 1936 | R | 5,956 | 8,764 | 15,056 | |
| 1932 | R | 5,047 | 7,307 | 12,507 | |
| 1928 | R | 3,500 | 7,793 | 11,320 | |
| 1924 | R | 2,366 | 8,038 | 10,687 | |
| 1920 | R | 2,012 | 6,420 | 8,568 | |
| 1916 | R | 2,224 | 2,837 | 5,142 | |
| 1912 | R | 1,691 | 2,129 | 4,741 | |
| 1908 | R | 1,278 | 3,043 | 4,579 | |
| 1904 | R | 1,197 | 3,189 | 4,515 | |
| 1900 | R | 960 | 2,421 | 3,649 | |
| 1896 | R | 654 | 3,040 | 4,219 | |
| 1892 | R | 1,501 | 2,183 | 4,132 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Washington County covers Rhode Island's southern coastline, where a mix of beach tourism, agriculture, and university influence around South Kingstown produces Democratic margins that have held steady across recent cycles despite the county's largely rural character.
The Democratic margin in Washington County reached its widest at forty-one points in 1964. The margin in 2024 was fifteen points — still decisive.
Washington County's loyalty is rooted in its place. Median household income of $106,638, a 90% non-Hispanic-white share, and a population of 130,344 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 Capitol Planning Region and Lower Connecticut River Valley Planning Region.
