| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 11,752 | 24,276 | 36,736 | |
| 2020 | R | 11,958 | 23,800 | 36,399 | |
| 2016 | R | 9,340 | 20,939 | 32,500 | |
| 2012 | R | 12,165 | 18,860 | 31,670 | |
| 2008 | R | 13,856 | 18,077 | 32,687 | |
| 2004 | R | 12,038 | 19,734 | 32,178 | |
| 2000 | R | 9,844 | 16,963 | 28,511 | |
| 1996 | R | 10,519 | 11,808 | 25,850 | |
| 1992 | R | 9,176 | 11,074 | 26,670 | |
| 1988 | R | 10,373 | 14,015 | 24,604 | |
| 1984 | R | 9,714 | 15,664 | 25,551 | |
| 1980 | R | 9,108 | 15,091 | 26,138 | |
| 1976 | R | 11,881 | 12,113 | 24,510 | |
| 1972 | R | 7,881 | 13,519 | 21,731 | |
| 1968 | R | 7,400 | 12,483 | 20,701 | |
| 1964 | R | 9,997 | 10,542 | 20,565 | |
| 1960 | R | 8,054 | 13,747 | 21,843 | |
| 1956 | R | 6,571 | 12,764 | 19,375 | |
| 1952 | R | 5,388 | 16,447 | 21,921 | |
| 1948 | R | 6,546 | 11,131 | 18,172 | |
| 1944 | R | 5,823 | 12,351 | 18,284 | |
| 1940 | R | 7,705 | 13,737 | 21,629 | |
| 1936 | R | 8,642 | 8,899 | 18,110 | |
| 1932 | D | 8,805 | 7,416 | 16,964 | |
| 1928 | R | 4,990 | 11,624 | 17,025 | |
| 1924 | R | 568 | 7,557 | 13,629 | |
| 1920 | R | 1,741 | 11,084 | 14,119 | |
| 1916 | R | 2,858 | 4,328 | 7,966 | |
| 1912 | D | 1,739 | 755 | 6,546 | |
| 1908 | R | 2,320 | 3,964 | 6,826 | |
| 1904 | R | 869 | 4,642 | 6,299 | |
| 1900 | R | 3,257 | 3,446 | 7,303 | |
| 1896 | D | 4,482 | 3,544 | 8,294 | |
| 1892 | D | 2,140 | 1,642 | 5,722 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Otter Tail's 1,000-plus lakes draw seasonal tourism, but its year-round population skews rural and older — a demographic profile that has tracked closely with the broader shift toward lopsided Republican margins across Minnesota's lake belt.
The Republican margin in Otter Tail County reached its widest at sixty-six points in 1920. The margin in 2024 was thirty-four points, in line with the county's deep historical pattern.
Otter Tail County's loyalty is rooted in its place. Median household income of $72,255, a 91% non-Hispanic-white share, and a population of 60,475 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 Brown County and Bottineau County.
