| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 778 | 4,387 | 5,309 | |
| 2020 | R | 875 | 4,800 | 5,798 | |
| 2016 | R | 671 | 3,908 | 4,871 | |
| 2012 | R | 1,002 | 3,510 | 4,648 | |
| 2008 | R | 1,203 | 3,184 | 4,516 | |
| 2004 | R | 1,120 | 3,110 | 4,308 | |
| 2000 | R | 1,018 | 2,858 | 4,033 | |
| 1996 | R | 1,614 | 2,021 | 4,568 | |
| 1992 | R | 1,440 | 1,760 | 4,748 | |
| 1988 | R | 1,824 | 2,628 | 4,546 | |
| 1984 | R | 1,382 | 3,847 | 5,281 | |
| 1980 | R | 1,252 | 3,348 | 5,038 | |
| 1976 | R | 1,961 | 2,189 | 4,263 | |
| 1972 | R | 1,438 | 2,645 | 4,300 | |
| 1968 | R | 1,399 | 2,381 | 4,016 | |
| 1964 | D | 2,320 | 1,784 | 4,131 | |
| 1960 | R | 1,863 | 2,395 | 4,269 | |
| 1956 | R | 1,884 | 2,366 | 4,250 | |
| 1952 | R | 1,196 | 2,506 | 3,725 | |
| 1948 | D | 1,673 | 1,332 | 3,090 | |
| 1944 | D | 1,777 | 1,347 | 3,161 | |
| 1940 | D | 2,095 | 1,497 | 3,645 | |
| 1936 | D | 2,516 | 1,066 | 3,677 | |
| 1932 | D | 1,768 | 1,216 | 3,116 | |
| 1928 | R | 917 | 1,648 | 2,594 | |
| 1924 | R | 238 | 926 | 1,854 | |
| 1920 | R | 744 | 1,759 | 2,687 | |
| 1916 | D | 1,947 | 1,223 | 3,350 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Richland County, anchored by the oil-patch city of Sidney, recorded an R+68 presidential margin in 2024 — among the widest gaps in a state already tilted heavily toward Republican candidates at the federal level.
The Republican margin in Richland County reached its widest at sixty-eight points in 2024. The margin in 2024 was sixty-eight points, in line with the county's deep historical pattern.
Richland County's loyalty is rooted in its place. Median household income of $73,084, a 90% non-Hispanic-white share, and a population of 11,235 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 Wibaux County and Williams County.
