| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 33 | 351 | 389 | |
| 2020 | R | 44 | 380 | 427 | |
| 2016 | R | 43 | 362 | 430 | |
| 2012 | R | 83 | 341 | 437 | |
| 2008 | R | 106 | 297 | 411 | |
| 2004 | R | 89 | 335 | 432 | |
| 2000 | R | 85 | 316 | 442 | |
| 1996 | R | 123 | 260 | 445 | |
| 1992 | R | 145 | 226 | 535 | |
| 1988 | R | 202 | 315 | 530 | |
| 1984 | R | 174 | 419 | 605 | |
| 1980 | R | 128 | 462 | 647 | |
| 1976 | R | 347 | 355 | 726 | |
| 1972 | R | 249 | 413 | 690 | |
| 1968 | R | 238 | 379 | 682 | |
| 1964 | D | 436 | 329 | 765 | |
| 1960 | R | 431 | 475 | 906 | |
| 1956 | R | 397 | 433 | 833 | |
| 1952 | R | 290 | 682 | 983 | |
| 1948 | R | 388 | 447 | 885 | |
| 1944 | D | 439 | 434 | 878 | |
| 1940 | R | 585 | 801 | 1,391 | |
| 1936 | D | 896 | 331 | 1,421 | |
| 1932 | D | 1,136 | 461 | 1,660 | |
| 1928 | R | 542 | 873 | 1,434 | |
| 1924 | R | 47 | 616 | 1,576 | |
| 1920 | R | 235 | 1,143 | 1,493 | |
| 1916 | D | 867 | 516 | 1,481 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Slope County's 767 residents spread across 1,200 square miles of western North Dakota badlands, producing presidential margins that consistently rank among the widest of any county in the United States.
The Republican margin in Slope County reached its widest at eighty-two points in 2024. The margin in 2024 was eighty-two points, in line with the county's deep historical pattern.
Slope County's loyalty is rooted in its place. Median household income of $71,250, a 92% non-Hispanic-white share, and a population of 766 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 Musselshell County and Webster County.
