| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 2,933 | 1,939 | 5,078 | |
| 2020 | D | 3,610 | 1,884 | 5,617 | |
| 2016 | D | 3,121 | 1,620 | 5,075 | |
| 2012 | D | 2,924 | 1,415 | 4,455 | |
| 2008 | D | 3,423 | 1,451 | 4,970 | |
| 2004 | D | 2,641 | 1,828 | 4,562 | |
| 2000 | D | 2,211 | 1,709 | 4,124 | |
| 1996 | D | 2,292 | 1,270 | 4,095 | |
| 1992 | D | 2,076 | 1,222 | 4,323 | |
| 1988 | D | 2,151 | 1,728 | 4,004 | |
| 1984 | R | 2,167 | 2,228 | 4,435 | |
| 1980 | R | 1,394 | 2,283 | 4,093 | |
| 1976 | R | 1,755 | 1,892 | 3,724 | |
| 1972 | R | 1,469 | 2,143 | 3,819 | |
| 1968 | D | 1,723 | 1,643 | 3,671 | |
| 1964 | D | 2,218 | 1,458 | 3,697 | |
| 1960 | D | 2,260 | 1,775 | 4,039 | |
| 1956 | R | 1,822 | 2,054 | 3,876 | |
| 1952 | R | 1,698 | 2,061 | 3,769 | |
| 1948 | D | 2,238 | 1,238 | 3,508 | |
| 1944 | D | 2,142 | 1,228 | 3,379 | |
| 1940 | D | 2,399 | 1,352 | 3,760 | |
| 1936 | D | 2,453 | 781 | 3,265 | |
| 1932 | D | 1,717 | 702 | 2,439 | |
| 1928 | D | 976 | 847 | 1,826 | |
| 1924 | R | 511 | 586 | 1,406 | |
| 1920 | R | 531 | 1,297 | 1,876 | |
| 1916 | — | — | — | — | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Glacier County's politics are shaped by the Blackfeet Reservation, which covers most of its land area and drives Democratic margins that run sharply against Montana's statewide Republican lean.
The Democratic margin in Glacier County peaked at fifty-one points in 1936. By 1988 the county had flipped, voting Republican for the first time in many years. The 2024 margin was twenty points, the most Democratic-leaning result in the county's modern history.
The economic context is the key. Glacier County's median household income of $46,875 sits well below state and national norms, and 31% 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 Hawaii County and Maui County.