| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 10,080 | 14,455 | 24,895 | |
| 2020 | R | 10,105 | 13,671 | 24,159 | |
| 2016 | R | 8,109 | 12,132 | 21,531 | |
| 2012 | R | 10,452 | 10,917 | 21,652 | |
| 2008 | D | 11,907 | 9,630 | 21,927 | |
| 2004 | R | 10,464 | 11,351 | 22,039 | |
| 2000 | R | 8,339 | 9,512 | 18,891 | |
| 1996 | D | 7,619 | 6,339 | 16,917 | |
| 1992 | D | 7,160 | 6,725 | 18,714 | |
| 1988 | R | 7,414 | 8,130 | 15,670 | |
| 1984 | R | 6,417 | 9,787 | 16,369 | |
| 1980 | R | 7,008 | 8,602 | 16,805 | |
| 1976 | R | 7,216 | 7,347 | 14,916 | |
| 1972 | R | 4,262 | 6,811 | 11,577 | |
| 1968 | R | 4,435 | 5,077 | 10,458 | |
| 1964 | D | 6,431 | 3,909 | 10,355 | |
| 1960 | R | 4,974 | 5,676 | 10,666 | |
| 1956 | R | 3,328 | 6,261 | 9,648 | |
| 1952 | R | 3,808 | 6,224 | 10,062 | |
| 1948 | D | 4,081 | 3,729 | 8,015 | |
| 1944 | D | 4,076 | 3,253 | 7,383 | |
| 1940 | D | 5,375 | 3,694 | 9,146 | |
| 1936 | D | 5,208 | 2,294 | 8,056 | |
| 1932 | D | 4,542 | 1,992 | 6,913 | |
| 1928 | R | 2,504 | 3,100 | 5,707 | |
| 1924 | R | 324 | 1,769 | 5,350 | |
| 1920 | R | 833 | 2,424 | 3,733 | |
| 1916 | R | 1,054 | 1,089 | 2,410 | |
| 1912 | R | 717 | 774 | 2,117 | |
| 1908 | R | 688 | 1,536 | 2,607 | |
| 1904 | R | 375 | 1,710 | 2,265 | |
| 1900 | R | 708 | 1,802 | 2,562 | |
| 1896 | R | 563 | 1,453 | 2,057 | |
| 1892 | D | 1,317 | 1,149 | 2,542 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Oneida County's economy revolves around lakes, logging, and seasonal tourism, and it has shifted steadily toward Republican margins over the past decade, landing at R+17.6 in 2024 despite a sizable Ho-Chunk and Ojibwe community presence in the region.
The county's recent history is a story of close margins. The Democratic margin reached thirty-seven points in 1932; the Republican margin reached fifty-nine points in 1904. Most other elections have been decided by single-digit points.
Oneida County's demographics — a population of 38,167, a 94% non-Hispanic-white share, a median household income of $69,371 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Wood County and Menominee County.