| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 17,161 | 19,432 | 37,793 | |
| 2020 | R | 17,354 | 19,877 | 38,441 | |
| 2016 | R | 12,020 | 14,067 | 29,301 | |
| 2012 | D | 15,960 | 11,914 | 28,947 | |
| 2008 | D | 16,354 | 12,104 | 29,184 | |
| 2004 | D | 14,583 | 12,871 | 27,953 | |
| 2000 | D | 13,304 | 11,225 | 25,972 | |
| 1996 | D | 14,082 | 7,635 | 26,250 | |
| 1992 | D | 12,599 | 6,904 | 27,238 | |
| 1988 | D | 14,097 | 8,860 | 23,391 | |
| 1984 | D | 14,050 | 11,286 | 25,671 | |
| 1980 | D | 11,290 | 10,226 | 25,444 | |
| 1976 | D | 13,478 | 9,464 | 23,893 | |
| 1972 | D | 11,786 | 10,839 | 23,745 | |
| 1968 | D | 13,480 | 7,720 | 22,684 | |
| 1964 | D | 17,145 | 5,744 | 23,027 | |
| 1960 | D | 13,773 | 10,067 | 24,006 | |
| 1956 | D | 12,858 | 11,599 | 24,514 | |
| 1952 | D | 12,317 | 12,168 | 24,683 | |
| 1948 | D | 13,660 | 8,357 | 23,215 | |
| 1944 | D | 13,803 | 7,834 | 21,767 | |
| 1940 | D | 14,861 | 8,369 | 23,487 | |
| 1936 | D | 15,851 | 5,053 | 21,622 | |
| 1932 | D | 10,310 | 5,141 | 18,436 | |
| 1928 | R | 5,258 | 10,798 | 16,286 | |
| 1924 | R | 1,239 | 8,273 | 13,751 | |
| 1920 | R | 3,378 | 5,920 | 11,622 | |
| 1916 | R | 4,992 | 5,024 | 11,336 | |
| 1912 | R | 1,953 | 3,055 | 8,814 | |
| 1908 | R | 1,248 | 3,128 | 5,183 | |
| 1904 | R | 624 | 2,589 | 3,800 | |
| 1900 | R | 1,081 | 1,850 | 3,148 | |
| 1896 | D | 1,350 | 1,267 | 2,641 | |
| 1892 | R | 798 | 990 | 2,356 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Grays Harbor once anchored Democratic strength on Washington's coast, driven by timber and fishing unions, but decades of industry decline have reoriented its electorate, and it backed the Republican presidential candidate by six points in 2024.
The Democratic margin in Grays Harbor County has rarely exceeded fifty points in modern history; the Republican margin has rarely exceeded fifty-two points. 2024 delivered the county to the Republican candidate by six points.
Grays Harbor County's demographics resemble the country more than they resemble most counties. A 79% non-Hispanic-white share, a 15% poverty rate, and a median household income of $64,414 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Pacific County and Pueblo County.
