| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 54,314 | 32,965 | 89,581 | |
| 2020 | D | 57,067 | 35,285 | 95,573 | |
| 2016 | D | 50,137 | 33,368 | 91,628 | |
| 2012 | D | 40,831 | 35,312 | 78,609 | |
| 2008 | D | 48,597 | 33,871 | 84,143 | |
| 2004 | D | 41,524 | 39,896 | 82,434 | |
| 2000 | D | 35,515 | 34,645 | 74,285 | |
| 1996 | D | 32,454 | 28,232 | 66,429 | |
| 1992 | D | 35,003 | 27,096 | 76,092 | |
| 1988 | R | 29,733 | 33,247 | 63,499 | |
| 1984 | R | 27,266 | 39,224 | 66,925 | |
| 1980 | R | 21,017 | 33,329 | 65,360 | |
| 1976 | R | 26,858 | 34,546 | 63,107 | |
| 1972 | R | 24,743 | 33,700 | 58,679 | |
| 1968 | R | 18,425 | 26,027 | 48,648 | |
| 1964 | D | 25,792 | 22,010 | 47,802 | |
| 1960 | R | 17,115 | 27,793 | 45,441 | |
| 1956 | R | 13,799 | 28,190 | 42,040 | |
| 1952 | R | 13,951 | 27,188 | 41,251 | |
| 1948 | R | 11,572 | 19,156 | 31,465 | |
| 1944 | R | 13,842 | 18,935 | 32,954 | |
| 1940 | R | 17,563 | 20,314 | 38,144 | |
| 1936 | D | 18,203 | 15,808 | 34,535 | |
| 1932 | D | 16,474 | 13,995 | 31,070 | |
| 1928 | R | 8,915 | 19,494 | 28,550 | |
| 1924 | R | 5,221 | 14,244 | 22,677 | |
| 1920 | R | 5,247 | 15,573 | 21,681 | |
| 1916 | R | 9,601 | 14,632 | 25,286 | |
| 1912 | D | 4,454 | 3,220 | 12,570 | |
| 1908 | R | 4,830 | 7,162 | 12,531 | |
| 1904 | R | 3,754 | 6,954 | 11,382 | |
| 1900 | R | 5,015 | 6,660 | 12,095 | |
| 1896 | R | 4,643 | 6,780 | 11,758 | |
| 1892 | R | 4,502 | 5,290 | 10,386 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to the University of Illinois Urbana-Champaign, Champaign County leans heavily Democratic by downstate standards, posting a D+23.8 margin in 2024 — a pattern consistent with college-town counties nationwide.
The Democratic margin in Champaign County reached its widest at twenty-four points in 2024. The margin in 2024 was twenty-four points — still decisive.
Champaign County's loyalty is rooted in its place. Median household income of $63,683, a 64% non-Hispanic-white share, and a population of 208,741 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 Washington County and Santa Barbara County.
