| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,125 | 2,877 | 4,073 | |
| 2020 | R | 1,256 | 2,824 | 4,165 | |
| 2016 | R | 1,220 | 2,582 | 4,106 | |
| 2012 | R | 1,403 | 1,962 | 3,457 | |
| 2008 | D | 1,477 | 1,406 | 2,938 | |
| 2004 | R | 1,465 | 1,527 | 3,030 | |
| 2000 | R | 1,256 | 1,466 | 2,896 | |
| 1996 | D | 1,277 | 965 | 2,615 | |
| 1992 | D | 1,393 | 1,017 | 3,289 | |
| 1988 | D | 1,977 | 1,443 | 3,458 | |
| 1984 | R | 1,565 | 1,959 | 3,555 | |
| 1980 | R | 1,183 | 2,165 | 3,587 | |
| 1976 | D | 2,189 | 1,430 | 3,708 | |
| 1972 | R | 1,391 | 2,038 | 3,496 | |
| 1968 | D | 1,662 | 1,494 | 3,370 | |
| 1964 | D | 2,548 | 1,131 | 3,683 | |
| 1960 | D | 2,264 | 1,894 | 4,163 | |
| 1956 | D | 1,891 | 1,699 | 3,597 | |
| 1952 | R | 1,437 | 2,516 | 3,998 | |
| 1948 | D | 1,521 | 1,395 | 3,304 | |
| 1944 | D | 1,981 | 1,666 | 3,693 | |
| 1940 | D | 2,392 | 1,981 | 4,435 | |
| 1936 | D | 2,775 | 700 | 4,769 | |
| 1932 | D | 3,284 | 986 | 4,448 | |
| 1928 | R | 2,003 | 2,354 | 4,501 | |
| 1924 | R | 130 | 1,354 | 3,741 | |
| 1920 | R | 687 | 2,960 | 4,070 | |
| 1916 | D | 1,262 | 740 | 2,267 | |
| 1912 | R | 307 | 407 | 1,451 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Mountrail County sits atop the Bakken Formation and has shifted decisively toward Republican presidential candidates over the past two decades, posting a 43-point margin in 2024 despite a Native American population that historically tempers GOP totals in similar prairie counties.
The Republican margin in Mountrail County reached its widest at fifty-six points in 1920. The margin in 2024 was forty-three points, in line with the county's deep historical pattern.
Mountrail County's loyalty is rooted in its place. Median household income of $80,717, a 58% non-Hispanic-white share, and a population of 9,507 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 Emmet County and Jackson County.