| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,350 | 4,857 | 7,318 | |
| 2020 | R | 2,576 | 4,735 | 7,422 | |
| 2016 | R | 2,421 | 4,093 | 7,035 | |
| 2012 | D | 3,553 | 3,264 | 6,934 | |
| 2008 | D | 3,971 | 2,965 | 7,059 | |
| 2004 | R | 3,449 | 3,530 | 7,062 | |
| 2000 | R | 2,883 | 3,277 | 6,462 | |
| 1996 | D | 2,551 | 2,457 | 5,781 | |
| 1992 | R | 2,362 | 2,627 | 6,679 | |
| 1988 | R | 2,768 | 3,186 | 5,995 | |
| 1984 | R | 2,282 | 3,997 | 6,354 | |
| 1980 | R | 2,170 | 4,000 | 6,586 | |
| 1976 | R | 2,568 | 3,648 | 6,303 | |
| 1972 | R | 2,271 | 4,150 | 6,562 | |
| 1968 | R | 2,245 | 4,449 | 7,110 | |
| 1964 | R | 3,504 | 3,691 | 7,200 | |
| 1960 | R | 2,933 | 4,970 | 7,916 | |
| 1956 | R | 2,622 | 5,182 | 7,824 | |
| 1952 | R | 2,341 | 6,087 | 8,438 | |
| 1948 | R | 3,172 | 4,474 | 7,726 | |
| 1944 | R | 2,893 | 5,017 | 7,929 | |
| 1940 | R | 3,258 | 5,840 | 9,122 | |
| 1936 | D | 4,327 | 4,053 | 8,763 | |
| 1932 | D | 4,783 | 3,009 | 7,848 | |
| 1928 | R | 3,227 | 4,785 | 8,051 | |
| 1924 | R | 1,289 | 2,755 | 7,175 | |
| 1920 | R | 1,833 | 5,192 | 7,090 | |
| 1916 | R | 1,714 | 2,411 | 4,159 | |
| 1912 | D | 1,767 | 1,269 | 4,361 | |
| 1908 | R | 1,725 | 2,521 | 4,297 | |
| 1904 | R | 1,571 | 2,609 | 4,224 | |
| 1900 | R | 1,850 | 2,659 | 4,550 | |
| 1896 | R | 1,897 | 2,471 | 4,480 | |
| 1892 | D | 1,956 | 1,832 | 3,903 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Allamakee County sits at Iowa's scenic northeast tip along the Mississippi River, and its presidential margins have widened steadily over the past decade — the 2024 gap of R+34 reflects a rural realignment that has reshaped most of the Driftless region.
The Republican margin in Allamakee County reached its widest at forty-seven points in 1920. The margin in 2024 was thirty-four points, in line with the county's deep historical pattern.
Allamakee County's loyalty is rooted in its place. Median household income of $70,694, a 88% non-Hispanic-white share, and a population of 14,092 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 Marinette County and Menominee County.