| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 14,433 | 29,322 | 45,338 | |
| 2020 | R | 14,520 | 29,391 | 45,309 | |
| 2016 | R | 9,654 | 21,992 | 35,199 | |
| 2012 | R | 12,664 | 20,452 | 34,320 | |
| 2008 | R | 13,624 | 20,278 | 34,705 | |
| 2004 | R | 10,726 | 21,042 | 32,428 | |
| 2000 | R | 9,891 | 18,565 | 29,986 | |
| 1996 | R | 10,331 | 13,238 | 27,644 | |
| 1992 | R | 7,810 | 12,316 | 27,168 | |
| 1988 | R | 8,629 | 14,184 | 23,238 | |
| 1984 | R | 7,634 | 15,846 | 23,931 | |
| 1980 | R | 6,962 | 13,636 | 22,749 | |
| 1976 | R | 9,026 | 10,933 | 21,167 | |
| 1972 | R | 6,946 | 12,071 | 20,585 | |
| 1968 | R | 8,444 | 8,779 | 18,668 | |
| 1964 | D | 12,070 | 6,933 | 19,022 | |
| 1960 | R | 8,411 | 11,012 | 19,480 | |
| 1956 | R | 7,714 | 11,949 | 19,688 | |
| 1952 | R | 7,115 | 12,287 | 19,571 | |
| 1948 | R | 8,394 | 9,047 | 17,953 | |
| 1944 | R | 7,706 | 8,896 | 16,726 | |
| 1940 | D | 9,280 | 9,228 | 18,726 | |
| 1936 | D | 9,619 | 5,885 | 16,705 | |
| 1932 | D | 8,454 | 4,647 | 15,594 | |
| 1928 | R | 3,591 | 9,253 | 13,010 | |
| 1924 | R | 1,544 | 6,973 | 12,007 | |
| 1920 | R | 2,212 | 6,160 | 11,285 | |
| 1916 | R | 4,318 | 5,186 | 10,601 | |
| 1912 | R | 2,471 | 3,200 | 9,786 | |
| 1908 | R | 1,412 | 3,170 | 5,244 | |
| 1904 | R | 896 | 3,098 | 4,430 | |
| 1900 | R | 1,382 | 1,907 | 3,442 | |
| 1896 | D | 1,654 | 1,594 | 3,297 | |
| 1892 | R | 1,014 | 1,350 | 3,254 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Lewis County's economy has long centered on logging and agriculture, and its rural, predominantly white electorate has shifted steadily rightward over three decades — making it one of western Washington's most reliably Republican counties in statewide contests.
The Democratic margin in Lewis County peaked at twenty-seven points in 1964. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was thirty-three points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Lewis County's median household income of $74,796 sits well below state and national norms, and 12% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Burleigh County and Humboldt County.