| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 870 | 3,885 | 4,814 | |
| 2020 | R | 930 | 3,828 | 4,852 | |
| 2016 | R | 824 | 3,540 | 4,626 | |
| 2012 | R | 1,194 | 3,056 | 4,350 | |
| 2008 | R | 1,692 | 2,889 | 4,683 | |
| 2004 | R | 1,707 | 2,941 | 4,686 | |
| 2000 | R | 1,562 | 2,363 | 4,049 | |
| 1996 | D | 1,679 | 1,627 | 3,846 | |
| 1992 | D | 1,630 | 1,318 | 4,171 | |
| 1988 | D | 1,970 | 1,863 | 3,843 | |
| 1984 | R | 1,464 | 2,188 | 3,652 | |
| 1980 | R | 1,677 | 2,062 | 3,885 | |
| 1976 | D | 2,023 | 1,739 | 3,779 | |
| 1972 | R | 1,339 | 2,766 | 4,105 | |
| 1968 | R | 1,452 | 2,112 | 3,849 | |
| 1964 | D | 2,347 | 1,679 | 4,026 | |
| 1960 | R | 1,697 | 2,484 | 4,181 | |
| 1956 | R | 1,872 | 2,538 | 4,410 | |
| 1952 | R | 1,773 | 3,073 | 4,856 | |
| 1948 | R | 2,033 | 2,098 | 4,135 | |
| 1944 | R | 1,961 | 2,658 | 4,625 | |
| 1940 | R | 2,505 | 3,072 | 5,593 | |
| 1936 | R | 2,680 | 2,872 | 5,570 | |
| 1932 | D | 2,519 | 1,747 | 4,288 | |
| 1928 | R | 1,898 | 3,338 | 5,254 | |
| 1924 | R | 2,368 | 2,730 | 5,192 | |
| 1920 | R | 2,121 | 3,001 | 5,189 | |
| 1916 | D | 1,647 | 1,640 | 3,332 | |
| 1912 | D | 1,652 | 1,090 | 3,292 | |
| 1908 | R | 1,632 | 1,703 | 3,370 | |
| 1904 | R | 1,607 | 1,768 | 3,451 | |
| 1900 | D | 1,840 | 1,669 | 3,612 | |
| 1896 | D | 2,167 | 1,590 | 3,786 | |
| 1892 | D | 1,372 | 1,339 | 3,218 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
With roughly 11,600 residents concentrated in small towns and farmland, De Kalb County has delivered Republican presidential margins above 60 points, reflecting a broader realignment of sparsely populated northwest Missouri.
The Republican margin in DeKalb County reached its widest at sixty-three points in 2024. The margin in 2024 was sixty-three points, in line with the county's deep historical pattern.
DeKalb County's loyalty is rooted in its place. Median household income of $69,826, a 88% non-Hispanic-white share, and a population of 10,876 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 Marion County and Shelby County.
