| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,909 | 3,636 | 5,642 | |
| 2020 | R | 2,135 | 3,707 | 5,970 | |
| 2016 | R | 1,931 | 3,447 | 5,864 | |
| 2012 | R | 2,903 | 2,906 | 5,918 | |
| 2008 | D | 3,254 | 2,730 | 6,082 | |
| 2004 | R | 2,707 | 3,175 | 5,952 | |
| 2000 | D | 2,691 | 2,662 | 5,527 | |
| 1996 | D | 2,679 | 2,211 | 5,521 | |
| 1992 | R | 2,322 | 2,407 | 6,078 | |
| 1988 | R | 2,804 | 2,863 | 5,703 | |
| 1984 | R | 2,669 | 3,616 | 6,314 | |
| 1980 | R | 2,208 | 3,808 | 6,479 | |
| 1976 | R | 2,950 | 3,315 | 6,346 | |
| 1972 | R | 2,324 | 4,300 | 6,669 | |
| 1968 | R | 2,163 | 3,543 | 5,954 | |
| 1964 | D | 3,677 | 2,331 | 6,017 | |
| 1960 | R | 2,463 | 4,082 | 6,549 | |
| 1956 | R | 2,521 | 3,926 | 6,453 | |
| 1952 | R | 1,905 | 4,574 | 6,499 | |
| 1948 | R | 2,626 | 2,636 | 5,451 | |
| 1944 | R | 2,654 | 2,808 | 5,480 | |
| 1940 | R | 3,051 | 3,308 | 6,388 | |
| 1936 | D | 3,133 | 2,592 | 5,927 | |
| 1932 | D | 3,281 | 2,012 | 5,499 | |
| 1928 | R | 1,268 | 3,386 | 4,831 | |
| 1924 | R | 225 | 2,445 | 5,172 | |
| 1920 | R | 469 | 3,931 | 4,514 | |
| 1916 | R | 584 | 1,713 | 2,349 | |
| 1912 | R | 390 | 532 | 2,231 | |
| 1908 | R | 489 | 1,710 | 2,248 | |
| 1904 | R | 174 | 2,002 | 2,238 | |
| 1900 | R | 474 | 2,052 | 2,577 | |
| 1896 | R | 714 | 1,912 | 2,651 | |
| 1892 | R | 342 | 1,083 | 1,614 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Winnebago County's roughly 11,700 residents are concentrated in Forest City, the county seat, and have shifted steadily rightward in presidential voting over the past decade, reaching a 30-point Republican margin in 2024.
The Republican margin in Winnebago County reached its widest at eighty-two points in 1904. The margin in 2024 was thirty-one points, in line with the county's deep historical pattern.
Winnebago County's loyalty is rooted in its place. Median household income of $67,642, a 89% non-Hispanic-white share, and a population of 10,583 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 Monroe County and Kewaunee County.
