| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,634 | 3,871 | 6,804 | |
| 2020 | R | 2,981 | 3,957 | 7,182 | |
| 2016 | R | 2,371 | 3,478 | 6,445 | |
| 2012 | D | 3,403 | 3,164 | 6,825 | |
| 2008 | D | 3,596 | 2,787 | 6,624 | |
| 2004 | R | 2,997 | 3,505 | 6,657 | |
| 2000 | R | 2,760 | 3,392 | 6,558 | |
| 1996 | D | 3,517 | 2,601 | 7,111 | |
| 1992 | D | 3,618 | 2,408 | 8,082 | |
| 1988 | D | 4,219 | 3,467 | 7,791 | |
| 1984 | R | 3,657 | 4,635 | 8,390 | |
| 1980 | R | 2,875 | 4,448 | 8,089 | |
| 1976 | D | 3,878 | 3,274 | 7,260 | |
| 1972 | R | 3,061 | 3,759 | 7,085 | |
| 1968 | D | 3,386 | 2,970 | 6,669 | |
| 1964 | D | 4,491 | 2,101 | 6,604 | |
| 1960 | D | 3,741 | 3,163 | 6,916 | |
| 1956 | R | 2,999 | 3,415 | 6,414 | |
| 1952 | R | 2,748 | 3,474 | 6,266 | |
| 1948 | D | 3,321 | 1,645 | 5,181 | |
| 1944 | D | 2,986 | 1,646 | 4,669 | |
| 1940 | D | 3,700 | 1,842 | 5,617 | |
| 1936 | D | 4,328 | 1,014 | 5,520 | |
| 1932 | D | 3,257 | 1,589 | 5,054 | |
| 1928 | R | 2,022 | 2,336 | 4,377 | |
| 1924 | R | 602 | 1,110 | 3,628 | |
| 1920 | R | 1,388 | 2,220 | 4,004 | |
| 1916 | D | 3,241 | 1,709 | 5,386 | |
| 1912 | D | 624 | 536 | 2,028 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Hill County sits along Montana's northern rail corridor, anchored by Havre, and has shifted steadily toward Republican margins over the past two decades despite a Native American population that historically offsets statewide trends.
The county's recent history is a story of close margins. The Democratic margin reached sixty points in 1936; the Republican margin reached twenty-one points in 1920. Most other elections have been decided by single-digit points.
Hill County's demographics — a population of 16,155, a 68% non-Hispanic-white share, a median household income of $52,798 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Skamania County and Koochiching County.