| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 13,971 | 22,341 | 37,452 | |
| 2020 | R | 15,456 | 23,315 | 39,885 | |
| 2016 | R | 12,175 | 19,632 | 34,571 | |
| 2012 | R | 15,232 | 18,345 | 34,576 | |
| 2008 | D | 17,664 | 16,857 | 35,388 | |
| 2004 | R | 13,701 | 19,028 | 33,459 | |
| 2000 | R | 13,137 | 18,164 | 33,317 | |
| 1996 | D | 15,707 | 14,291 | 35,006 | |
| 1992 | D | 14,719 | 12,494 | 36,578 | |
| 1988 | R | 15,718 | 15,946 | 32,124 | |
| 1984 | R | 14,252 | 19,846 | 34,505 | |
| 1980 | R | 11,105 | 17,664 | 32,234 | |
| 1976 | R | 14,678 | 15,289 | 30,511 | |
| 1972 | R | 12,899 | 16,159 | 30,836 | |
| 1968 | D | 13,507 | 11,588 | 26,803 | |
| 1964 | D | 17,609 | 8,986 | 26,714 | |
| 1960 | D | 14,117 | 11,928 | 26,090 | |
| 1956 | R | 11,098 | 12,455 | 23,553 | |
| 1952 | R | 11,051 | 12,176 | 23,373 | |
| 1948 | D | 12,082 | 6,830 | 19,817 | |
| 1944 | D | 10,924 | 6,372 | 17,437 | |
| 1940 | D | 13,637 | 6,443 | 20,324 | |
| 1936 | D | 13,325 | 4,077 | 17,789 | |
| 1932 | D | 10,047 | 5,800 | 16,823 | |
| 1928 | R | 6,540 | 8,183 | 14,856 | |
| 1924 | R | 2,220 | 5,081 | 11,706 | |
| 1920 | R | 3,938 | 6,808 | 11,572 | |
| 1916 | D | 6,612 | 3,253 | 10,641 | |
| 1912 | D | 1,633 | 1,079 | 4,549 | |
| 1908 | R | 1,888 | 1,935 | 4,313 | |
| 1904 | R | 1,385 | 2,405 | 4,346 | |
| 1900 | D | 2,564 | 1,997 | 4,648 | |
| 1896 | D | 2,920 | 953 | 3,888 | |
| 1892 | R | 1,184 | 1,295 | 2,864 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to Malmstrom Air Force Base and a substantial military population, Cascade County delivered a 22-point Republican margin in 2024 despite being one of Montana's more urbanized counties by Great Plains standards.
The Republican margin in Cascade County reached its widest at twenty-five points in 1920. The margin in 2024 was twenty-two points, in line with the county's deep historical pattern.
Cascade County's loyalty is rooted in its place. Median household income of $67,690, a 84% non-Hispanic-white share, and a population of 84,606 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 Nelson County and Spencer County.
