| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 77 | 597 | 680 | |
| 2020 | R | 72 | 642 | 731 | |
| 2016 | R | 81 | 616 | 736 | |
| 2012 | R | 101 | 624 | 739 | |
| 2008 | R | 117 | 603 | 732 | |
| 2004 | R | 123 | 677 | 809 | |
| 2000 | R | 98 | 629 | 752 | |
| 1996 | R | 138 | 551 | 768 | |
| 1992 | R | 148 | 445 | 802 | |
| 1988 | R | 194 | 568 | 767 | |
| 1984 | R | 121 | 732 | 860 | |
| 1980 | R | 120 | 760 | 932 | |
| 1976 | R | 329 | 532 | 883 | |
| 1972 | R | 129 | 639 | 768 | |
| 1968 | R | 157 | 565 | 791 | |
| 1964 | R | 379 | 698 | 1,077 | |
| 1960 | R | 415 | 745 | 1,160 | |
| 1956 | R | 260 | 499 | 759 | |
| 1952 | R | 300 | 1,093 | 1,393 | |
| 1948 | R | 520 | 657 | 1,177 | |
| 1944 | R | 408 | 876 | 1,284 | |
| 1940 | R | 618 | 1,072 | 1,690 | |
| 1936 | D | 956 | 674 | 1,658 | |
| 1932 | D | 1,006 | 667 | 1,704 | |
| 1928 | R | 435 | 1,178 | 1,624 | |
| 1924 | R | 149 | 480 | 1,333 | |
| 1920 | R | 252 | 627 | 965 | |
| 1916 | D | 737 | 344 | 1,128 | |
| 1912 | D | 375 | 150 | 991 | |
| 1908 | R | 464 | 516 | 1,015 | |
| 1904 | R | 111 | 247 | 398 | |
| 1900 | D | 248 | 199 | 448 | |
| 1896 | D | 306 | 155 | 467 | |
| 1892 | D | 139 | 90 | 424 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Sioux County, tucked into Nebraska's northwestern Panhandle, recorded an R+76.7 margin in 2024, making it among the most one-sided counties in the country — a reflection of its sparse, ranching-dependent population and deep rural conservatism.
The Republican margin in Sioux County reached its widest at seventy-eight points in 2020. The margin in 2024 was seventy-six points, in line with the county's deep historical pattern.
Sioux County's loyalty is rooted in its place. Median household income of $53,929, a 96% non-Hispanic-white share, and a population of 1,171 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 Kiowa County and Hayes County.
