| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 509 | 1,321 | 1,912 | |
| 2020 | R | 574 | 1,403 | 2,030 | |
| 2016 | R | 477 | 1,241 | 1,835 | |
| 2012 | R | 665 | 1,207 | 1,928 | |
| 2008 | R | 953 | 987 | 2,006 | |
| 2004 | R | 846 | 1,159 | 2,038 | |
| 2000 | R | 702 | 1,176 | 1,965 | |
| 1996 | D | 1,187 | 832 | 2,435 | |
| 1992 | D | 1,077 | 795 | 2,663 | |
| 1988 | R | 1,354 | 1,381 | 2,763 | |
| 1984 | R | 1,087 | 1,774 | 2,879 | |
| 1980 | R | 955 | 1,658 | 2,912 | |
| 1976 | D | 1,560 | 1,114 | 2,714 | |
| 1972 | R | 1,197 | 1,500 | 2,780 | |
| 1968 | D | 1,275 | 1,180 | 2,576 | |
| 1964 | D | 1,905 | 837 | 2,754 | |
| 1960 | D | 1,549 | 1,196 | 2,754 | |
| 1956 | D | 1,857 | 1,153 | 3,010 | |
| 1952 | D | 1,347 | 1,339 | 2,711 | |
| 1948 | D | 1,515 | 699 | 2,453 | |
| 1944 | D | 1,713 | 791 | 2,548 | |
| 1940 | D | 2,108 | 892 | 3,052 | |
| 1936 | D | 2,503 | 513 | 3,168 | |
| 1932 | D | 1,450 | 739 | 3,246 | |
| 1928 | R | 1,190 | 1,624 | 2,971 | |
| 1924 | R | 176 | 905 | 2,562 | |
| 1920 | R | 610 | 1,335 | 2,497 | |
| 1916 | D | 3,264 | 1,724 | 5,363 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Sheridan County sits in Montana's northeastern corner along the North Dakota border, where a sparse, agriculture-dependent population has delivered Republican presidential margins exceeding 40 points in recent cycles.
The county has voted both ways in living memory. The Democratic margin peaked at sixty-three points in 1936; the Republican margin peaked at forty-two points in 2024. The 2024 margin of forty-two points fits the pattern of swing.
Sheridan County's demographics — a population of 3,669, a 91% non-Hispanic-white share, a median household income of $70,147 — describe a Western place. The county shares the Western pattern of independence with White County and Dickinson County.
