| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 156 | 909 | 1,087 | |
| 2020 | R | 129 | 918 | 1,066 | |
| 2016 | R | 119 | 830 | 1,017 | |
| 2012 | R | 281 | 693 | 1,013 | |
| 2008 | R | 332 | 682 | 1,040 | |
| 2004 | R | 310 | 790 | 1,119 | |
| 2000 | R | 244 | 709 | 1,051 | |
| 1996 | R | 333 | 499 | 1,022 | |
| 1992 | R | 306 | 503 | 1,228 | |
| 1988 | R | 526 | 696 | 1,237 | |
| 1984 | R | 419 | 915 | 1,357 | |
| 1980 | R | 270 | 966 | 1,316 | |
| 1976 | R | 529 | 575 | 1,140 | |
| 1972 | R | 293 | 669 | 1,027 | |
| 1968 | R | 269 | 616 | 971 | |
| 1964 | D | 548 | 469 | 1,017 | |
| 1960 | R | 494 | 703 | 1,198 | |
| 1956 | R | 279 | 788 | 1,079 | |
| 1952 | R | 143 | 1,132 | 1,289 | |
| 1948 | R | 304 | 749 | 1,104 | |
| 1944 | R | 219 | 756 | 984 | |
| 1940 | R | 266 | 1,356 | 1,623 | |
| 1936 | D | 906 | 469 | 1,573 | |
| 1932 | D | 1,152 | 302 | 1,469 | |
| 1928 | R | 631 | 680 | 1,316 | |
| 1924 | R | 31 | 367 | 1,141 | |
| 1920 | R | 111 | 1,105 | 1,287 | |
| 1916 | R | 327 | 346 | 724 | |
| 1912 | D | 139 | 131 | 578 | |
| 1908 | R | 179 | 325 | 520 | |
| 1904 | R | 46 | 241 | 296 | |
| 1900 | R | 75 | 110 | 187 | |
| 1896 | R | 58 | 59 | 117 | |
| 1892 | R | 0 | 35 | 83 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Oliver County's 2,065 residents have delivered some of the widest presidential margins in the state, reflecting the deep rural Republican lean common across the northern Great Plains. Sparse settlement and an agricultural economy define its political geography.
The Republican margin in Oliver County reached its widest at seventy-seven points in 1920. The margin in 2024 was sixty-nine points, in line with the county's deep historical pattern.
Oliver County's loyalty is rooted in its place. Median household income of $77,240, a 99% non-Hispanic-white share, and a population of 1,839 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 Morton County and McKenzie County.
