| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 4,284 | 8,400 | 12,990 | |
| 2020 | R | 4,634 | 7,979 | 12,893 | |
| 2016 | R | 3,825 | 7,256 | 12,215 | |
| 2012 | R | 5,465 | 6,594 | 12,388 | |
| 2008 | R | 6,110 | 6,315 | 12,708 | |
| 2004 | R | 5,292 | 7,203 | 12,673 | |
| 2000 | R | 4,737 | 6,087 | 11,489 | |
| 1996 | D | 5,062 | 4,932 | 11,477 | |
| 1992 | R | 4,481 | 4,591 | 12,324 | |
| 1988 | R | 5,657 | 5,969 | 11,736 | |
| 1984 | R | 5,389 | 7,170 | 12,659 | |
| 1980 | R | 5,626 | 5,852 | 12,911 | |
| 1976 | D | 7,122 | 5,036 | 12,458 | |
| 1972 | R | 5,614 | 5,820 | 11,630 | |
| 1968 | D | 5,317 | 4,331 | 9,966 | |
| 1964 | D | 6,649 | 3,165 | 9,822 | |
| 1960 | D | 5,550 | 4,740 | 10,305 | |
| 1956 | R | 4,190 | 5,188 | 9,386 | |
| 1952 | R | 4,030 | 6,015 | 10,069 | |
| 1948 | D | 6,144 | 3,054 | 9,286 | |
| 1944 | D | 4,640 | 3,617 | 8,295 | |
| 1940 | D | 5,234 | 4,305 | 9,575 | |
| 1936 | D | 5,163 | 2,551 | 8,424 | |
| 1932 | D | 4,989 | 2,264 | 7,383 | |
| 1928 | R | 3,274 | 4,058 | 7,388 | |
| 1924 | R | 334 | 3,519 | 6,553 | |
| 1920 | R | 1,232 | 4,557 | 6,229 | |
| 1916 | D | 1,893 | 1,389 | 3,564 | |
| 1912 | D | 1,068 | 460 | 2,939 | |
| 1908 | R | 1,043 | 1,618 | 2,854 | |
| 1904 | R | 330 | 2,394 | 2,926 | |
| 1900 | R | 879 | 1,844 | 2,854 | |
| 1896 | R | 1,351 | 1,623 | 3,072 | |
| 1892 | D | 1,068 | 486 | 2,099 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Lyon County sits in southwest Minnesota's agricultural flatlands, where a farm-dependent economy and a predominantly white, non-college electorate have produced some of the state's most consistent Republican presidential margins over the past decade.
The Republican margin in Lyon County reached its widest at seventy-one points in 1904. The margin in 2024 was thirty-two points, in line with the county's deep historical pattern.
Lyon County's loyalty is rooted in its place. Median household income of $75,303, a 82% non-Hispanic-white share, and a population of 25,503 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 Taylor County and Washington County.