| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,145 | 5,794 | 7,110 | |
| 2020 | R | 1,220 | 4,937 | 6,313 | |
| 2016 | R | 933 | 3,789 | 5,162 | |
| 2012 | R | 1,225 | 3,138 | 4,544 | |
| 2008 | R | 1,484 | 3,078 | 4,733 | |
| 2004 | R | 1,268 | 3,012 | 4,379 | |
| 2000 | R | 832 | 2,797 | 3,884 | |
| 1996 | R | 1,194 | 1,937 | 3,870 | |
| 1992 | R | 1,095 | 1,479 | 3,774 | |
| 1988 | R | 1,336 | 1,800 | 3,202 | |
| 1984 | R | 1,158 | 2,159 | 3,402 | |
| 1980 | R | 1,087 | 2,088 | 3,513 | |
| 1976 | R | 1,217 | 1,458 | 2,796 | |
| 1972 | R | 860 | 1,587 | 2,678 | |
| 1968 | R | 883 | 1,084 | 2,297 | |
| 1964 | D | 1,418 | 1,065 | 2,483 | |
| 1960 | D | 1,501 | 1,237 | 2,738 | |
| 1956 | R | 1,150 | 1,419 | 2,569 | |
| 1952 | R | 1,040 | 1,641 | 2,691 | |
| 1948 | D | 1,029 | 910 | 2,099 | |
| 1944 | R | 1,053 | 1,064 | 2,160 | |
| 1940 | D | 1,393 | 1,221 | 2,684 | |
| 1936 | D | 1,304 | 732 | 2,162 | |
| 1932 | D | 1,451 | 763 | 2,288 | |
| 1928 | R | 607 | 1,015 | 1,646 | |
| 1924 | R | 244 | 829 | 1,765 | |
| 1920 | R | 525 | 883 | 1,408 | |
| 1916 | D | 653 | 598 | 1,357 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Tucked into Idaho's panhandle along the Canadian border, Boundary County delivered one of the state's widest presidential margins in 2024, reflecting the deep-red alignment common to rural, timber-economy communities in the inland Northwest.
The Republican margin in Boundary County reached its widest at sixty-five points in 2024. The margin in 2024 was sixty-five points, in line with the county's deep historical pattern.
Boundary County's loyalty is rooted in its place. Median household income of $67,237, a 83% non-Hispanic-white share, and a population of 13,172 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 Adams County and Stevens County.
