| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,934 | 9,287 | 12,441 | |
| 2020 | R | 3,228 | 9,931 | 13,426 | |
| 2016 | R | 2,637 | 8,679 | 12,004 | |
| 2012 | R | 3,501 | 8,630 | 12,417 | |
| 2008 | R | 4,338 | 9,309 | 13,907 | |
| 2004 | R | 4,338 | 9,598 | 14,116 | |
| 2000 | R | 4,770 | 8,496 | 13,745 | |
| 1996 | R | 5,269 | 7,428 | 14,365 | |
| 1992 | R | 5,453 | 6,848 | 15,912 | |
| 1988 | R | 5,429 | 9,067 | 14,628 | |
| 1984 | R | 4,933 | 12,023 | 17,127 | |
| 1980 | R | 5,282 | 10,856 | 16,915 | |
| 1976 | R | 7,157 | 8,864 | 16,391 | |
| 1972 | R | 3,685 | 11,717 | 15,907 | |
| 1968 | R | 5,210 | 9,697 | 17,386 | |
| 1964 | D | 8,853 | 8,437 | 17,416 | |
| 1960 | R | 7,938 | 12,536 | 20,638 | |
| 1956 | R | 7,265 | 13,252 | 20,598 | |
| 1952 | R | 7,679 | 14,261 | 22,070 | |
| 1948 | R | 8,621 | 10,636 | 19,444 | |
| 1944 | R | 7,063 | 11,738 | 18,844 | |
| 1940 | R | 9,999 | 13,781 | 23,894 | |
| 1936 | R | 11,535 | 11,565 | 23,167 | |
| 1932 | R | 9,941 | 9,958 | 20,339 | |
| 1928 | R | 4,205 | 14,316 | 18,760 | |
| 1924 | R | 4,178 | 11,160 | 17,163 | |
| 1920 | R | 5,657 | 10,044 | 16,145 | |
| 1916 | D | 8,059 | 6,371 | 15,369 | |
| 1912 | D | 3,011 | 1,842 | 8,971 | |
| 1908 | R | 4,030 | 5,166 | 9,916 | |
| 1904 | R | 2,091 | 4,997 | 7,698 | |
| 1900 | R | 3,213 | 3,433 | 6,694 | |
| 1896 | D | 3,132 | 2,714 | 5,894 | |
| 1892 | R | 0 | 2,514 | 5,279 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Montgomery County's 2024 presidential margin of R+51 places it among the most lopsided counties in Kansas, a pattern consistent with the broader rural shift across the southeastern Osage Plains over the past decade.
The Democratic margin in Montgomery County peaked at thirteen points in 1912. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-one points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Montgomery County's median household income of $55,697 sits well below state and national norms, and 16% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Taney County and Christian County.