| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,056 | 4,699 | 5,906 | |
| 2020 | R | 1,156 | 4,462 | 5,724 | |
| 2016 | R | 908 | 3,661 | 4,873 | |
| 2012 | R | 1,248 | 3,337 | 4,702 | |
| 2008 | R | 1,512 | 2,991 | 4,667 | |
| 2004 | R | 1,025 | 3,090 | 4,213 | |
| 2000 | R | 925 | 2,765 | 3,918 | |
| 1996 | R | 1,282 | 1,871 | 3,800 | |
| 1992 | R | 1,178 | 1,390 | 3,640 | |
| 1988 | R | 1,407 | 1,920 | 3,379 | |
| 1984 | R | 1,100 | 2,118 | 3,258 | |
| 1980 | R | 919 | 1,828 | 2,984 | |
| 1976 | R | 1,143 | 1,446 | 2,635 | |
| 1972 | R | 716 | 1,698 | 2,499 | |
| 1968 | R | 676 | 1,347 | 2,201 | |
| 1964 | R | 1,130 | 1,140 | 2,271 | |
| 1960 | R | 1,036 | 1,455 | 2,491 | |
| 1956 | R | 1,013 | 1,540 | 2,553 | |
| 1952 | R | 816 | 1,689 | 2,520 | |
| 1948 | R | 890 | 1,137 | 2,087 | |
| 1944 | R | 934 | 1,201 | 2,142 | |
| 1940 | R | 1,201 | 1,255 | 2,475 | |
| 1936 | D | 1,292 | 1,034 | 2,422 | |
| 1932 | D | 1,281 | 1,085 | 2,453 | |
| 1928 | R | 711 | 1,687 | 2,408 | |
| 1924 | R | 375 | 1,412 | 2,358 | |
| 1920 | R | 664 | 1,721 | 2,441 | |
| 1916 | D | 1,197 | 918 | 2,185 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Stillwater County, anchored by the small city of Columbus, sits in south-central Montana's Yellowstone River corridor and posted a Republican presidential margin exceeding 60 points in 2024, placing it among the state's most one-sided jurisdictions.
The Republican margin in Stillwater County reached its widest at sixty-two points in 2024. The margin in 2024 was sixty-two points, in line with the county's deep historical pattern.
Stillwater County's loyalty is rooted in its place. Median household income of $84,732, a 93% non-Hispanic-white share, and a population of 9,182 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 Toole County and Bowman County.