| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 3,674 | 5,288 | 9,187 | |
| 2020 | R | 3,983 | 5,323 | 9,603 | |
| 2016 | R | 2,722 | 4,274 | 7,588 | |
| 2012 | R | 3,332 | 4,372 | 7,845 | |
| 2008 | R | 3,491 | 4,492 | 8,094 | |
| 2004 | R | 2,531 | 4,703 | 7,328 | |
| 2000 | R | 2,660 | 3,977 | 6,866 | |
| 1996 | R | 2,444 | 3,686 | 6,790 | |
| 1992 | R | 2,559 | 2,928 | 7,556 | |
| 1988 | R | 2,721 | 3,782 | 6,573 | |
| 1984 | R | 2,296 | 4,464 | 6,821 | |
| 1980 | R | 2,357 | 3,534 | 6,304 | |
| 1976 | R | 2,843 | 3,230 | 6,196 | |
| 1972 | R | 1,708 | 4,299 | 6,140 | |
| 1968 | R | 2,228 | 2,954 | 5,827 | |
| 1964 | D | 3,419 | 2,259 | 5,745 | |
| 1960 | R | 2,365 | 3,789 | 6,183 | |
| 1956 | R | 2,078 | 4,013 | 6,123 | |
| 1952 | R | 1,750 | 4,314 | 6,116 | |
| 1948 | R | 2,810 | 2,864 | 5,760 | |
| 1944 | R | 2,107 | 2,833 | 4,973 | |
| 1940 | R | 2,504 | 2,840 | 5,394 | |
| 1936 | D | 2,973 | 2,382 | 5,367 | |
| 1932 | D | 2,705 | 1,957 | 4,783 | |
| 1928 | R | 1,203 | 2,746 | 3,971 | |
| 1924 | R | 723 | 2,678 | 4,037 | |
| 1920 | R | 962 | 2,404 | 3,456 | |
| 1916 | D | 1,740 | 1,731 | 3,591 | |
| 1912 | D | 800 | 387 | 2,226 | |
| 1908 | R | 1,033 | 1,257 | 2,355 | |
| 1904 | R | 591 | 1,431 | 2,108 | |
| 1900 | R | 1,009 | 1,240 | 2,273 | |
| 1896 | D | 1,171 | 1,051 | 2,248 | |
| 1892 | R | 0 | 1,113 | 2,020 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to Fort Riley, Geary County carries an unusually transient population of active-duty families, which depresses long-term registration rates and produces turnout patterns distinct from surrounding rural Kansas counties.
The Republican margin in Geary County reached its widest at fifty-five points in 1892. The margin in 2024 was eighteen points, in line with the county's deep historical pattern.
Geary County's loyalty is rooted in its place. Median household income of $59,317, a 59% non-Hispanic-white share, and a population of 35,815 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 Lyon County and Sedgwick County.
