| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 25,637 | 45,206 | 72,024 | |
| 2020 | R | 24,449 | 41,392 | 67,094 | |
| 2016 | R | 18,050 | 34,183 | 56,120 | |
| 2012 | R | 20,806 | 31,123 | 52,775 | |
| 2008 | R | 24,165 | 30,061 | 55,279 | |
| 2004 | R | 19,355 | 34,022 | 53,907 | |
| 2000 | R | 15,495 | 28,197 | 44,891 | |
| 1996 | R | 14,361 | 20,859 | 38,790 | |
| 1992 | R | 12,823 | 19,077 | 40,835 | |
| 1988 | R | 10,785 | 22,163 | 33,188 | |
| 1984 | R | 8,389 | 23,762 | 32,338 | |
| 1980 | R | 9,877 | 20,560 | 33,031 | |
| 1976 | R | 9,794 | 19,330 | 29,471 | |
| 1972 | R | 7,883 | 18,407 | 26,884 | |
| 1968 | R | 7,276 | 14,769 | 24,483 | |
| 1964 | D | 11,934 | 11,223 | 23,194 | |
| 1960 | R | 6,752 | 16,660 | 23,472 | |
| 1956 | R | 5,617 | 16,509 | 22,177 | |
| 1952 | R | 5,437 | 15,663 | 21,338 | |
| 1948 | R | 4,594 | 10,439 | 15,424 | |
| 1944 | R | 4,480 | 12,327 | 16,878 | |
| 1940 | R | 5,385 | 12,347 | 17,792 | |
| 1936 | R | 5,922 | 9,247 | 16,106 | |
| 1932 | R | 7,030 | 8,705 | 16,082 | |
| 1928 | R | 2,358 | 10,792 | 13,217 | |
| 1924 | R | 1,562 | 9,417 | 11,872 | |
| 1920 | R | 2,154 | 7,825 | 10,311 | |
| 1916 | R | 3,591 | 4,803 | 8,763 | |
| 1912 | R | 1,925 | 2,121 | 7,596 | |
| 1908 | R | 2,186 | 5,422 | 8,054 | |
| 1904 | R | 1,576 | 5,589 | 7,555 | |
| 1900 | R | 3,275 | 5,590 | 9,144 | |
| 1896 | R | 3,937 | 5,810 | 10,043 | |
| 1892 | R | 3,207 | 4,283 | 8,405 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Allegan County, anchored by small manufacturing towns and agricultural townships along Lake Michigan's eastern shore, has delivered double-digit Republican presidential margins consistently since the 1990s, with 2024's R+27.2 representing its widest recent spread.
The Republican margin in Allegan County reached its widest at sixty-six points in 1924. The margin in 2024 was twenty-seven points, in line with the county's deep historical pattern.
Allegan County's loyalty is rooted in its place. Median household income of $83,283, a 87% non-Hispanic-white share, and a population of 121,456 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 Douglas County and Hancock County.