| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,280 | 5,610 | 8,058 | |
| 2020 | R | 2,496 | 5,467 | 8,128 | |
| 2016 | R | 2,117 | 4,890 | 7,606 | |
| 2012 | R | 3,394 | 4,149 | 7,710 | |
| 2008 | R | 3,904 | 3,956 | 8,135 | |
| 2004 | R | 3,787 | 4,430 | 8,349 | |
| 2000 | R | 3,533 | 4,036 | 8,122 | |
| 1996 | D | 3,956 | 2,887 | 8,238 | |
| 1992 | D | 3,414 | 2,852 | 8,920 | |
| 1988 | D | 4,454 | 4,356 | 8,927 | |
| 1984 | R | 3,972 | 5,571 | 9,629 | |
| 1980 | R | 4,058 | 5,544 | 10,444 | |
| 1976 | D | 5,762 | 4,482 | 10,545 | |
| 1972 | R | 4,499 | 5,329 | 10,044 | |
| 1968 | R | 4,535 | 4,821 | 9,906 | |
| 1964 | D | 6,072 | 4,340 | 10,437 | |
| 1960 | R | 4,958 | 5,885 | 10,857 | |
| 1956 | R | 4,213 | 5,728 | 9,958 | |
| 1952 | R | 3,828 | 6,742 | 10,626 | |
| 1948 | D | 5,227 | 4,297 | 9,679 | |
| 1944 | R | 3,747 | 5,160 | 8,976 | |
| 1940 | R | 4,588 | 6,196 | 10,842 | |
| 1936 | D | 5,344 | 3,049 | 9,453 | |
| 1932 | D | 5,967 | 2,631 | 8,761 | |
| 1928 | R | 3,731 | 5,107 | 8,932 | |
| 1924 | R | 641 | 3,405 | 7,981 | |
| 1920 | R | 1,283 | 5,995 | 8,141 | |
| 1916 | R | 1,660 | 2,432 | 4,402 | |
| 1912 | D | 1,310 | 703 | 3,902 | |
| 1908 | R | 1,364 | 2,275 | 3,778 | |
| 1904 | R | 639 | 2,925 | 3,753 | |
| 1900 | R | 1,326 | 2,809 | 4,337 | |
| 1896 | R | 1,978 | 2,553 | 4,628 | |
| 1892 | D | 1,370 | 984 | 3,429 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Renville County's flat glacial-lake plains support one of the state's most intensive corn and soybean operations, and its electorate has shifted steadily rightward over two decades — the 2024 presidential margin of R+41 reflects a rural realignment well above the statewide average.
The Democratic margin in Renville County peaked at thirty-eight points in 1932. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-one points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Renville County's median household income of $70,625 sits well below state and national norms, and 11% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Le Sueur County and Wabasha County.