| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 39,923 | 51,842 | 93,986 | |
| 2020 | R | 40,482 | 49,249 | 92,326 | |
| 2016 | R | 30,618 | 42,053 | 78,281 | |
| 2012 | R | 34,674 | 40,342 | 76,583 | |
| 2008 | D | 39,838 | 39,251 | 80,552 | |
| 2004 | R | 32,314 | 44,189 | 77,632 | |
| 2000 | D | 33,428 | 27,042 | 61,369 | |
| 1996 | D | 29,790 | 27,432 | 62,004 | |
| 1992 | D | 27,016 | 25,081 | 63,786 | |
| 1988 | D | 29,135 | 26,765 | 56,095 | |
| 1984 | R | 23,042 | 29,908 | 53,171 | |
| 1980 | R | 20,008 | 26,256 | 51,478 | |
| 1976 | R | 22,068 | 23,286 | 45,556 | |
| 1972 | R | 22,386 | 22,447 | 44,988 | |
| 1968 | R | 16,462 | 20,141 | 37,780 | |
| 1964 | D | 20,929 | 16,766 | 37,695 | |
| 1960 | R | 15,152 | 23,238 | 38,390 | |
| 1956 | R | 13,093 | 22,285 | 35,378 | |
| 1952 | R | 9,390 | 23,559 | 32,949 | |
| 1948 | R | 11,770 | 14,047 | 26,125 | |
| 1944 | R | 10,216 | 13,920 | 24,136 | |
| 1940 | R | 12,259 | 16,664 | 28,923 | |
| 1936 | D | 13,174 | 12,418 | 26,508 | |
| 1932 | D | 12,646 | 10,288 | 23,273 | |
| 1928 | R | 6,805 | 13,741 | 20,608 | |
| 1924 | R | 1,524 | 8,822 | 15,773 | |
| 1920 | R | 2,534 | 8,290 | 13,127 | |
| 1916 | D | 4,318 | 3,494 | 8,203 | |
| 1912 | D | 2,576 | 0 | 6,078 | |
| 1908 | R | 1,948 | 4,125 | 6,438 | |
| 1904 | R | 1,046 | 4,455 | 6,017 | |
| 1900 | R | 2,440 | 3,410 | 5,978 | |
| 1896 | D | 2,667 | 2,429 | 5,146 | |
| 1892 | R | 484 | 2,208 | 4,221 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to Sioux Falls, Minnehaha holds roughly one-sixth of South Dakota's total population, and its suburban growth has gradually compressed what was once a wider Republican presidential margin over the past decade.
The county's recent history is a story of close margins. The Democratic margin reached forty-two points in 1912; the Republican margin reached fifty-seven points in 1904. Most other elections have been decided by single-digit points.
Minnehaha County's demographics — a population of 203,289, a 80% non-Hispanic-white share, a median household income of $76,880 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Spink County and Brown County.
