| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 12,865 | 17,184 | 31,257 | |
| 2020 | R | 13,835 | 17,150 | 32,221 | |
| 2016 | R | 10,167 | 13,217 | 26,618 | |
| 2012 | D | 12,004 | 10,772 | 23,875 | |
| 2008 | D | 13,390 | 10,413 | 24,768 | |
| 2004 | D | 12,563 | 11,868 | 24,917 | |
| 2000 | D | 10,331 | 9,369 | 21,195 | |
| 1996 | D | 9,275 | 6,205 | 18,476 | |
| 1992 | D | 8,298 | 5,227 | 19,402 | |
| 1988 | D | 8,983 | 6,424 | 15,806 | |
| 1984 | D | 8,219 | 7,811 | 16,105 | |
| 1980 | D | 7,124 | 6,623 | 15,505 | |
| 1976 | D | 8,005 | 5,226 | 13,859 | |
| 1972 | D | 5,997 | 5,348 | 12,284 | |
| 1968 | D | 6,064 | 4,208 | 11,047 | |
| 1964 | D | 7,728 | 2,489 | 10,268 | |
| 1960 | D | 5,546 | 4,356 | 9,908 | |
| 1956 | D | 5,592 | 4,275 | 9,867 | |
| 1952 | D | 5,096 | 4,666 | 9,834 | |
| 1948 | D | 4,768 | 3,049 | 8,251 | |
| 1944 | D | 5,213 | 2,696 | 8,049 | |
| 1940 | D | 5,758 | 2,959 | 8,774 | |
| 1936 | D | 5,587 | 1,815 | 7,801 | |
| 1932 | D | 3,643 | 1,975 | 5,937 | |
| 1928 | R | 1,775 | 3,519 | 5,396 | |
| 1924 | R | 1,015 | 2,483 | 4,418 | |
| 1920 | R | 970 | 2,007 | 3,262 | |
| 1916 | R | 1,451 | 2,023 | 3,750 | |
| 1912 | R | 507 | 574 | 2,046 | |
| 1908 | R | 454 | 1,242 | 1,950 | |
| 1904 | R | 221 | 1,301 | 1,752 | |
| 1900 | R | 403 | 863 | 1,332 | |
| 1896 | R | 831 | 1,022 | 1,882 | |
| 1892 | R | 270 | 682 | 1,487 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Columbia County sits along the Washington border northwest of Portland, and despite its proximity to the metro area, it has shifted roughly 10 points toward Republicans over the past two presidential cycles, reflecting broader rural realignment in the Pacific Northwest.
The Democratic margin in Columbia County has rarely exceeded fifty-one points in modern history; the Republican margin has rarely exceeded sixty-two points. 2024 delivered the county to the Republican candidate by fourteen points.
Columbia County's demographics resemble the country more than they resemble most counties. A 85% non-Hispanic-white share, a 9% poverty rate, and a median household income of $87,458 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Gogebic County and Dunn County.
