| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 795 | 1,163 | 2,002 | |
| 2020 | R | 822 | 1,094 | 1,961 | |
| 2016 | R | 842 | 929 | 2,011 | |
| 2012 | D | 1,235 | 868 | 2,157 | |
| 2008 | D | 1,569 | 733 | 2,334 | |
| 2004 | D | 1,196 | 1,002 | 2,246 | |
| 2000 | R | 952 | 1,055 | 2,154 | |
| 1996 | D | 1,059 | 850 | 2,172 | |
| 1992 | D | 1,126 | 874 | 2,625 | |
| 1988 | D | 1,691 | 1,316 | 3,031 | |
| 1984 | R | 1,599 | 1,729 | 3,363 | |
| 1980 | R | 1,119 | 2,149 | 3,587 | |
| 1976 | D | 1,973 | 1,689 | 3,725 | |
| 1972 | R | 1,635 | 2,050 | 3,721 | |
| 1968 | D | 1,772 | 1,707 | 3,643 | |
| 1964 | D | 2,566 | 1,489 | 4,060 | |
| 1960 | R | 2,181 | 2,259 | 4,443 | |
| 1956 | R | 1,851 | 2,340 | 4,203 | |
| 1952 | R | 1,353 | 3,192 | 4,584 | |
| 1948 | D | 2,216 | 1,920 | 4,331 | |
| 1944 | D | 2,261 | 1,726 | 4,010 | |
| 1940 | D | 2,898 | 2,485 | 5,420 | |
| 1936 | D | 3,343 | 1,020 | 5,363 | |
| 1932 | D | 3,650 | 1,170 | 4,917 | |
| 1928 | R | 2,194 | 2,621 | 4,872 | |
| 1924 | R | 246 | 1,870 | 4,156 | |
| 1920 | R | 680 | 3,540 | 4,365 | |
| 1916 | R | 922 | 1,210 | 2,270 | |
| 1912 | D | 594 | 515 | 1,971 | |
| 1908 | R | 553 | 1,363 | 2,010 | |
| 1904 | R | 143 | 1,111 | 1,298 | |
| 1900 | R | 319 | 1,084 | 1,436 | |
| 1896 | R | 227 | 549 | 783 | |
| 1892 | R | 0 | 419 | 609 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Benson County is home to the Spirit Lake Nation reservation, giving it a Native American population share well above state norms and producing presidential margins that have tightened in cycles tied closely to tribal turnout fluctuations.
The Democratic margin in Benson County has rarely exceeded fifty points in modern history; the Republican margin has rarely exceeded seventy-five points. 2024 delivered the county to the Republican candidate by eighteen points.
Benson County's demographics resemble the country more than they resemble most counties. A 43% non-Hispanic-white share, a 26% poverty rate, and a median household income of $64,033 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Winneshiek County and Norman County.
