| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 3,543 | 8,757 | 12,564 | |
| 2020 | R | 3,840 | 9,136 | 13,327 | |
| 2016 | R | 3,313 | 8,181 | 12,401 | |
| 2012 | R | 3,978 | 7,844 | 12,088 | |
| 2008 | R | 5,250 | 7,429 | 12,896 | |
| 2004 | R | 4,273 | 9,112 | 13,467 | |
| 2000 | R | 4,600 | 8,141 | 13,065 | |
| 1996 | R | 4,618 | 6,518 | 12,345 | |
| 1992 | R | 5,169 | 6,567 | 14,195 | |
| 1988 | R | 4,727 | 8,490 | 13,286 | |
| 1984 | R | 4,052 | 9,932 | 14,046 | |
| 1980 | R | 3,916 | 9,681 | 14,366 | |
| 1976 | R | 5,686 | 8,623 | 14,386 | |
| 1972 | R | 4,395 | 10,277 | 14,692 | |
| 1968 | R | 4,552 | 8,638 | 14,289 | |
| 1964 | D | 7,712 | 6,805 | 14,517 | |
| 1960 | R | 5,691 | 9,383 | 15,090 | |
| 1956 | R | 4,793 | 9,589 | 14,396 | |
| 1952 | R | 5,048 | 9,162 | 14,229 | |
| 1948 | R | 4,832 | 7,431 | 12,312 | |
| 1944 | R | 4,868 | 7,955 | 12,852 | |
| 1940 | R | 6,753 | 8,929 | 15,725 | |
| 1936 | D | 7,886 | 7,019 | 15,087 | |
| 1932 | D | 8,119 | 5,850 | 14,116 | |
| 1928 | R | 5,019 | 7,631 | 12,725 | |
| 1924 | R | 3,708 | 7,063 | 12,356 | |
| 1920 | R | 3,232 | 6,957 | 10,738 | |
| 1916 | R | 5,726 | 5,933 | 12,279 | |
| 1912 | D | 3,229 | 1,397 | 6,701 | |
| 1908 | D | 3,546 | 3,451 | 7,275 | |
| 1904 | R | 3,005 | 3,626 | 7,076 | |
| 1900 | D | 3,672 | 3,501 | 7,335 | |
| 1896 | R | 3,389 | 3,430 | 6,957 | |
| 1892 | D | 3,150 | 2,619 | 6,156 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Logan County's small-city and rural mix — anchored by Lincoln, the county seat — has shifted steadily toward lopsided Republican margins over the past two decades, mirroring a broader realignment across downstate Illinois farming communities.
The Democratic margin in Logan County peaked at twenty-seven points in 1912. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-one points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Logan County's median household income of $66,358 sits well below state and national norms, and 13% 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 Menard County and Whitley County.