| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,683 | 4,939 | 6,676 | |
| 2020 | R | 1,725 | 4,997 | 6,818 | |
| 2016 | R | 1,558 | 4,846 | 6,697 | |
| 2012 | R | 2,092 | 4,278 | 6,495 | |
| 2008 | R | 2,693 | 4,371 | 7,186 | |
| 2004 | R | 2,805 | 4,578 | 7,424 | |
| 2000 | R | 2,912 | 3,676 | 6,744 | |
| 1996 | D | 2,841 | 2,507 | 6,058 | |
| 1992 | D | 3,347 | 2,754 | 7,056 | |
| 1988 | R | 3,227 | 3,507 | 6,763 | |
| 1984 | R | 3,194 | 3,827 | 7,049 | |
| 1980 | R | 2,821 | 4,284 | 7,272 | |
| 1976 | D | 3,666 | 3,226 | 6,937 | |
| 1972 | R | 1,831 | 4,313 | 6,162 | |
| 1968 | R | 1,934 | 3,578 | 6,446 | |
| 1964 | D | 3,396 | 3,078 | 6,474 | |
| 1960 | R | 2,644 | 4,521 | 7,171 | |
| 1956 | R | 2,359 | 4,265 | 6,629 | |
| 1952 | R | 2,711 | 4,212 | 6,930 | |
| 1948 | R | 1,842 | 3,201 | 5,125 | |
| 1944 | R | 1,758 | 3,814 | 5,648 | |
| 1940 | R | 2,813 | 4,722 | 7,574 | |
| 1936 | R | 3,039 | 3,894 | 6,983 | |
| 1932 | R | 2,593 | 2,851 | 5,525 | |
| 1928 | R | 1,241 | 3,405 | 4,673 | |
| 1924 | R | 920 | 3,227 | 4,517 | |
| 1920 | R | 688 | 3,731 | 4,496 | |
| 1916 | R | 1,236 | 3,926 | 5,317 | |
| 1912 | R | 599 | 1,341 | 2,790 | |
| 1908 | R | 652 | 2,084 | 2,829 | |
| 1904 | R | 589 | 2,078 | 2,781 | |
| 1900 | R | 796 | 2,057 | 2,890 | |
| 1896 | R | 869 | 2,046 | 2,938 | |
| 1892 | R | 799 | 1,652 | 2,642 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Tucked into Illinois's Ohio River borderland, Massac County votes more like western Kentucky than the Chicago metro, with its 2024 presidential margin exceeding 48 points — among the widest in the state.
The Democratic margin in Massac County peaked at eight points in 1992. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-nine points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Massac County's median household income of $65,116 sits well below state and national norms, and 16% 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 Lewis County and Caldwell County.