| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,058 | 5,529 | 7,758 | |
| 2020 | R | 2,191 | 5,632 | 8,039 | |
| 2016 | R | 1,910 | 5,077 | 7,556 | |
| 2012 | R | 2,601 | 4,579 | 7,368 | |
| 2008 | R | 3,308 | 4,348 | 7,801 | |
| 2004 | R | 2,836 | 4,920 | 7,798 | |
| 2000 | R | 2,870 | 3,968 | 7,051 | |
| 1996 | R | 2,878 | 2,978 | 6,589 | |
| 1992 | R | 3,009 | 3,164 | 7,759 | |
| 1988 | R | 2,660 | 3,942 | 6,645 | |
| 1984 | R | 2,352 | 4,534 | 6,915 | |
| 1980 | R | 2,262 | 4,648 | 7,344 | |
| 1976 | R | 3,477 | 4,137 | 7,666 | |
| 1972 | R | 2,672 | 5,025 | 7,705 | |
| 1968 | R | 2,823 | 4,247 | 7,834 | |
| 1964 | D | 4,371 | 3,605 | 7,976 | |
| 1960 | R | 3,607 | 5,074 | 8,689 | |
| 1956 | R | 3,093 | 5,307 | 8,404 | |
| 1952 | R | 3,221 | 5,212 | 8,436 | |
| 1948 | R | 3,290 | 4,178 | 7,513 | |
| 1944 | R | 3,658 | 4,630 | 8,357 | |
| 1940 | R | 5,052 | 5,477 | 10,574 | |
| 1936 | D | 5,676 | 4,544 | 10,280 | |
| 1932 | D | 5,339 | 4,207 | 9,673 | |
| 1928 | R | 2,631 | 6,100 | 8,790 | |
| 1924 | R | 2,752 | 5,173 | 8,802 | |
| 1920 | R | 3,079 | 5,001 | 8,242 | |
| 1916 | D | 4,460 | 4,380 | 9,143 | |
| 1912 | D | 1,880 | 1,346 | 4,725 | |
| 1908 | R | 2,155 | 2,628 | 4,943 | |
| 1904 | R | 1,872 | 2,771 | 4,952 | |
| 1900 | R | 2,361 | 2,694 | 5,154 | |
| 1896 | R | 2,370 | 2,587 | 5,028 | |
| 1892 | D | 2,083 | 2,059 | 4,348 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
DeWitt County's 2024 presidential margin of R+44.7 reflects a broader rural realignment across central Illinois, where small-town agricultural communities have shifted sharply toward Republican candidates over the past two decades.
The Republican margin in De Witt County reached its widest at forty-five points in 2024. The margin in 2024 was forty-five points, in line with the county's deep historical pattern.
De Witt County's loyalty is rooted in its place. Median household income of $71,678, a 93% non-Hispanic-white share, and a population of 15,373 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 Johnson County and Pulaski County.
