| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 3,461 | 10,624 | 14,333 | |
| 2020 | R | 3,592 | 11,076 | 14,910 | |
| 2016 | R | 3,439 | 10,023 | 14,194 | |
| 2012 | R | 5,759 | 8,290 | 14,438 | |
| 2008 | R | 7,395 | 7,538 | 15,202 | |
| 2004 | R | 6,771 | 8,076 | 14,956 | |
| 2000 | R | 6,794 | 7,127 | 14,287 | |
| 1996 | D | 7,419 | 5,422 | 14,647 | |
| 1992 | D | 8,529 | 4,899 | 16,565 | |
| 1988 | D | 7,844 | 7,396 | 15,318 | |
| 1984 | R | 6,355 | 9,415 | 15,829 | |
| 1980 | R | 6,052 | 8,810 | 15,494 | |
| 1976 | D | 8,693 | 8,190 | 17,038 | |
| 1972 | R | 6,440 | 9,761 | 16,215 | |
| 1968 | R | 5,953 | 7,681 | 15,250 | |
| 1964 | D | 9,199 | 5,803 | 15,002 | |
| 1960 | R | 7,344 | 7,988 | 15,347 | |
| 1956 | R | 6,778 | 8,439 | 15,221 | |
| 1952 | R | 6,998 | 8,427 | 15,438 | |
| 1948 | R | 6,852 | 6,867 | 13,781 | |
| 1944 | R | 6,199 | 7,518 | 13,756 | |
| 1940 | R | 7,802 | 9,333 | 17,215 | |
| 1936 | D | 8,247 | 7,057 | 15,701 | |
| 1932 | D | 8,634 | 4,747 | 13,647 | |
| 1928 | D | 6,251 | 5,739 | 12,093 | |
| 1924 | R | 3,734 | 4,527 | 10,880 | |
| 1920 | R | 3,181 | 6,180 | 9,882 | |
| 1916 | R | 5,403 | 5,517 | 11,233 | |
| 1912 | D | 3,217 | 1,548 | 6,386 | |
| 1908 | D | 3,172 | 3,045 | 6,473 | |
| 1904 | R | 2,518 | 3,238 | 6,207 | |
| 1900 | D | 3,278 | 3,045 | 6,469 | |
| 1896 | D | 3,081 | 3,024 | 6,229 | |
| 1892 | D | 2,702 | 2,425 | 5,528 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Randolph County sits along Illinois's southwestern border with Missouri, and its 2024 presidential margin of R+50 points places it among the state's most lopsided rural counties — a sharp contrast to the statewide outcome.
The Democratic margin in Randolph County peaked at twenty-eight points in 1932. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Randolph County's median household income of $68,131 sits well below state and national norms, and 15% 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 Marion County and St. Francois County.