| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 261 | 1,477 | 1,775 | |
| 2020 | R | 281 | 1,629 | 1,945 | |
| 2016 | R | 233 | 1,460 | 1,788 | |
| 2012 | R | 324 | 1,479 | 1,838 | |
| 2008 | R | 403 | 1,490 | 1,930 | |
| 2004 | R | 454 | 1,587 | 2,075 | |
| 2000 | R | 484 | 1,432 | 2,030 | |
| 1996 | R | 608 | 1,582 | 2,392 | |
| 1992 | R | 779 | 1,003 | 2,607 | |
| 1988 | R | 943 | 1,541 | 2,544 | |
| 1984 | R | 686 | 2,171 | 2,909 | |
| 1980 | R | 620 | 2,188 | 2,984 | |
| 1976 | R | 1,190 | 1,574 | 2,840 | |
| 1972 | R | 724 | 2,182 | 2,972 | |
| 1968 | R | 793 | 2,073 | 3,170 | |
| 1964 | R | 1,659 | 1,700 | 3,401 | |
| 1960 | R | 1,152 | 2,731 | 3,903 | |
| 1956 | R | 1,023 | 2,948 | 3,999 | |
| 1952 | R | 754 | 3,577 | 4,403 | |
| 1948 | R | 1,420 | 2,603 | 4,140 | |
| 1944 | R | 1,078 | 2,827 | 3,953 | |
| 1940 | R | 1,488 | 3,424 | 4,995 | |
| 1936 | R | 2,200 | 2,765 | 4,978 | |
| 1932 | R | 2,231 | 2,555 | 4,919 | |
| 1928 | R | 821 | 3,683 | 4,528 | |
| 1924 | R | 905 | 3,333 | 4,658 | |
| 1920 | R | 980 | 3,060 | 4,110 | |
| 1916 | D | 2,621 | 2,149 | 5,081 | |
| 1912 | D | 972 | 733 | 2,737 | |
| 1908 | R | 1,132 | 1,665 | 3,011 | |
| 1904 | R | 420 | 1,765 | 2,484 | |
| 1900 | R | 1,239 | 1,555 | 2,857 | |
| 1896 | D | 1,403 | 1,325 | 2,769 | |
| 1892 | R | 0 | 1,380 | 2,561 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Osborne County, anchored by its small agricultural seat, recorded an R+68.5 margin in 2024—among the widest in a state already dominated by rural Republican strongholds. Its shrinking population reflects broader depopulation trends across the High Plains.
The Republican margin in Osborne County reached its widest at sixty-nine points in 2020. The margin in 2024 was sixty-nine points, in line with the county's deep historical pattern.
Osborne County's loyalty is rooted in its place. Median household income of $63,011, a 92% non-Hispanic-white share, and a population of 3,452 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 Graham County and Lincoln County.