| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 20,062 | 41,390 | 63,140 | |
| 2020 | R | 20,274 | 38,321 | 59,936 | |
| 2016 | R | 13,293 | 30,240 | 47,496 | |
| 2012 | R | 13,892 | 28,309 | 43,909 | |
| 2008 | R | 16,138 | 25,559 | 43,714 | |
| 2004 | R | 11,587 | 26,019 | 38,678 | |
| 2000 | R | 8,329 | 22,519 | 33,839 | |
| 1996 | R | 10,452 | 16,542 | 32,225 | |
| 1992 | R | 9,746 | 11,699 | 31,416 | |
| 1988 | R | 10,202 | 14,461 | 25,225 | |
| 1984 | R | 8,310 | 17,012 | 25,803 | |
| 1980 | R | 6,349 | 15,102 | 23,767 | |
| 1976 | R | 7,827 | 10,494 | 18,845 | |
| 1972 | R | 5,412 | 10,417 | 17,156 | |
| 1968 | R | 5,253 | 7,215 | 14,000 | |
| 1964 | D | 8,015 | 6,325 | 14,370 | |
| 1960 | R | 6,689 | 7,554 | 14,267 | |
| 1956 | R | 6,003 | 8,088 | 14,091 | |
| 1952 | R | 4,994 | 7,372 | 12,476 | |
| 1948 | D | 4,546 | 4,240 | 9,193 | |
| 1944 | R | 3,608 | 4,066 | 7,786 | |
| 1940 | D | 5,217 | 4,403 | 9,771 | |
| 1936 | D | 5,408 | 2,460 | 8,532 | |
| 1932 | D | 4,026 | 2,978 | 7,683 | |
| 1928 | R | 1,972 | 4,098 | 6,152 | |
| 1924 | R | 788 | 2,541 | 5,871 | |
| 1920 | R | 2,241 | 3,900 | 6,581 | |
| 1916 | D | 2,978 | 2,913 | 6,426 | |
| 1912 | D | 1,106 | 493 | 3,301 | |
| 1908 | R | 1,480 | 1,838 | 3,717 | |
| 1904 | R | 861 | 1,969 | 3,051 | |
| 1900 | D | 1,201 | 1,104 | 2,345 | |
| 1896 | D | 1,360 | 413 | 1,779 | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Flathead County anchors Montana's northwestern corner along the Rocky Mountain Front, drawing retirees and amenity migrants whose arrival has reinforced rather than diluted its existing tilt toward Republican candidates in every statewide race.
The Republican margin in Flathead County reached its widest at forty-two points in 2000. The margin in 2024 was thirty-four points, in line with the county's deep historical pattern.
Flathead County's loyalty is rooted in its place. Median household income of $73,925, a 91% non-Hispanic-white share, and a population of 110,695 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 Douglas County and Mariposa County.