| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 39,415 | 60,687 | 100,814 | |
| 2020 | R | 41,973 | 57,860 | 101,858 | |
| 2016 | R | 33,743 | 51,437 | 91,009 | |
| 2012 | R | 40,468 | 44,530 | 86,700 | |
| 2008 | R | 43,506 | 49,256 | 94,365 | |
| 2004 | R | 40,792 | 52,392 | 95,381 | |
| 2000 | R | 43,933 | 47,603 | 96,010 | |
| 1996 | D | 44,399 | 37,996 | 94,929 | |
| 1992 | R | 40,966 | 43,806 | 108,342 | |
| 1988 | R | 47,665 | 55,039 | 103,461 | |
| 1984 | R | 42,603 | 65,377 | 108,269 | |
| 1980 | R | 44,292 | 51,968 | 104,799 | |
| 1976 | R | 47,779 | 57,655 | 105,988 | |
| 1972 | R | 33,642 | 78,549 | 112,444 | |
| 1968 | R | 44,685 | 52,875 | 103,761 | |
| 1964 | D | 73,359 | 39,737 | 113,210 | |
| 1960 | D | 63,368 | 59,513 | 122,981 | |
| 1956 | R | 34,649 | 80,178 | 114,827 | |
| 1952 | R | 44,438 | 69,652 | 114,283 | |
| 1948 | D | 48,332 | 46,755 | 97,613 | |
| 1944 | R | 48,371 | 48,749 | 97,344 | |
| 1940 | R | 49,109 | 52,362 | 101,742 | |
| 1936 | R | 43,439 | 46,317 | 91,111 | |
| 1932 | R | 38,413 | 41,193 | 81,148 | |
| 1928 | R | 38,231 | 44,782 | 84,786 | |
| 1924 | R | 18,124 | 37,545 | 60,734 | |
| 1920 | R | 15,560 | 36,311 | 54,791 | |
| 1916 | R | 16,070 | 18,813 | 35,805 | |
| 1912 | D | 12,182 | 11,245 | 33,676 | |
| 1908 | R | 14,968 | 19,346 | 35,437 | |
| 1904 | R | 14,064 | 19,243 | 34,571 | |
| 1900 | R | 12,820 | 19,204 | 33,152 | |
| 1896 | R | 11,003 | 18,855 | 31,007 | |
| 1892 | R | 13,552 | 14,359 | 29,694 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Oneida County anchors the Mohawk Valley region, blending the mid-size city of Utica — which has absorbed significant refugee resettlement — with surrounding townships that vote heavily Republican, producing one of upstate New York's wider partisan gaps.
The Republican margin in Oneida County reached its widest at forty points in 1972. The margin in 2024 was twenty-one points, in line with the county's deep historical pattern.
Oneida County's loyalty is rooted in its place. Median household income of $70,154, a 80% non-Hispanic-white share, and a population of 229,124 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 Herkimer County and Fulton County.
