| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,445 | 4,029 | 5,620 | |
| 2020 | R | 1,570 | 4,218 | 5,892 | |
| 2016 | R | 1,433 | 3,651 | 5,509 | |
| 2012 | R | 1,869 | 3,316 | 5,310 | |
| 2008 | R | 2,189 | 3,552 | 5,859 | |
| 2004 | R | 1,922 | 3,867 | 5,873 | |
| 2000 | R | 2,132 | 3,379 | 5,766 | |
| 1996 | R | 2,299 | 2,797 | 5,943 | |
| 1992 | R | 2,312 | 2,351 | 6,430 | |
| 1988 | R | 2,392 | 3,429 | 5,898 | |
| 1984 | R | 1,778 | 4,267 | 6,117 | |
| 1980 | R | 2,009 | 3,811 | 6,317 | |
| 1976 | R | 2,746 | 3,269 | 6,141 | |
| 1972 | R | 1,610 | 3,938 | 5,669 | |
| 1968 | R | 1,875 | 3,520 | 5,900 | |
| 1964 | D | 3,369 | 2,841 | 6,252 | |
| 1960 | R | 2,540 | 4,947 | 7,508 | |
| 1956 | R | 2,143 | 5,342 | 7,508 | |
| 1952 | R | 2,160 | 6,045 | 8,236 | |
| 1948 | R | 2,891 | 4,704 | 7,685 | |
| 1944 | R | 2,262 | 5,032 | 7,340 | |
| 1940 | R | 3,178 | 6,376 | 9,600 | |
| 1936 | R | 3,869 | 6,071 | 9,945 | |
| 1932 | R | 4,249 | 4,510 | 8,936 | |
| 1928 | R | 1,803 | 6,695 | 8,550 | |
| 1924 | R | 2,181 | 6,101 | 8,723 | |
| 1920 | R | 2,272 | 5,091 | 7,522 | |
| 1916 | R | 4,053 | 4,129 | 8,641 | |
| 1912 | D | 1,739 | 1,692 | 4,825 | |
| 1908 | R | 2,579 | 3,283 | 6,102 | |
| 1904 | R | 1,380 | 3,754 | 5,516 | |
| 1900 | R | 2,073 | 2,680 | 4,823 | |
| 1896 | R | 1,656 | 1,833 | 3,552 | |
| 1892 | R | 0 | 1,398 | 2,947 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Allen County's 2024 presidential margin of R+46.1 reflects a broader pattern of lopsided Republican dominance across rural southeast Kansas, where small-town economies and sparse population have shifted voting patterns sharply over the past two decades.
The Democratic margin in Allen County peaked at eight points in 1964. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-six points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Allen County's median household income of $60,689 sits well below state and national norms, and 10% 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 Crowley County and Quay County.