| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 6,107 | 4,860 | 11,240 | |
| 2020 | D | 6,147 | 4,617 | 10,880 | |
| 2016 | D | 4,953 | 4,124 | 9,612 | |
| 2012 | D | 6,033 | 3,603 | 9,788 | |
| 2008 | D | 5,972 | 3,365 | 9,468 | |
| 2004 | D | 5,845 | 3,754 | 9,699 | |
| 2000 | D | 4,427 | 3,266 | 8,259 | |
| 1996 | D | 3,895 | 2,250 | 7,340 | |
| 1992 | D | 3,873 | 2,393 | 8,112 | |
| 1988 | D | 4,323 | 3,095 | 7,458 | |
| 1984 | D | 4,034 | 3,474 | 7,567 | |
| 1980 | D | 3,705 | 3,278 | 7,789 | |
| 1976 | D | 3,885 | 2,624 | 6,693 | |
| 1972 | R | 2,736 | 3,045 | 5,865 | |
| 1968 | D | 3,036 | 2,333 | 5,702 | |
| 1964 | D | 3,875 | 1,886 | 5,777 | |
| 1960 | D | 3,196 | 2,841 | 6,060 | |
| 1956 | R | 2,691 | 3,096 | 5,806 | |
| 1952 | R | 2,616 | 3,419 | 6,107 | |
| 1948 | D | 3,081 | 2,338 | 5,835 | |
| 1944 | D | 3,362 | 2,475 | 5,890 | |
| 1940 | D | 4,387 | 2,829 | 7,342 | |
| 1936 | D | 4,366 | 2,071 | 6,663 | |
| 1932 | D | 2,981 | 2,035 | 5,335 | |
| 1928 | R | 1,709 | 3,279 | 5,171 | |
| 1924 | R | 205 | 1,675 | 4,600 | |
| 1920 | R | 589 | 2,536 | 3,458 | |
| 1916 | R | 996 | 1,320 | 2,583 | |
| 1912 | D | 666 | 514 | 2,232 | |
| 1908 | R | 579 | 1,957 | 2,785 | |
| 1904 | R | 350 | 2,665 | 3,136 | |
| 1900 | R | 632 | 2,428 | 3,156 | |
| 1896 | R | 770 | 2,244 | 3,092 | |
| 1892 | R | 1,349 | 1,467 | 2,905 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Bayfield County's Bad River and Red Cliff Ojibwe reservations give it a demographic profile unlike most rural Wisconsin counties, and its consistent Democratic lean in presidential races reflects that distinct electorate alongside a significant retiree and outdoor-recreation population.
The Democratic margin in Bayfield County reached its widest at thirty-four points in 1936. The margin in 2024 was eleven points — still decisive.
Bayfield County's loyalty is rooted in its place. Median household income of $71,151, a 84% non-Hispanic-white share, and a population of 16,575 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 Rolette County and Ashland County.