| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 20,866 | 17,459 | 39,009 | |
| 2020 | D | 20,465 | 16,286 | 37,462 | |
| 2016 | D | 16,042 | 14,646 | 33,218 | |
| 2012 | D | 18,115 | 13,606 | 32,346 | |
| 2008 | D | 19,635 | 12,906 | 33,185 | |
| 2004 | D | 17,412 | 14,690 | 32,488 | |
| 2000 | D | 15,503 | 12,577 | 29,179 | |
| 1996 | D | 15,168 | 8,805 | 26,758 | |
| 1992 | D | 16,038 | 9,665 | 31,629 | |
| 1988 | D | 15,418 | 11,704 | 27,267 | |
| 1984 | R | 14,074 | 14,196 | 28,402 | |
| 1980 | D | 13,312 | 13,181 | 29,479 | |
| 1976 | R | 12,837 | 12,984 | 26,315 | |
| 1972 | R | 11,555 | 13,249 | 25,157 | |
| 1968 | D | 11,199 | 8,960 | 20,995 | |
| 1964 | D | 14,045 | 6,615 | 20,696 | |
| 1960 | D | 11,177 | 10,690 | 21,917 | |
| 1956 | R | 9,543 | 12,504 | 22,084 | |
| 1952 | R | 9,949 | 11,618 | 21,655 | |
| 1948 | D | 10,003 | 8,591 | 19,064 | |
| 1944 | D | 11,707 | 8,163 | 19,944 | |
| 1940 | D | 12,854 | 9,034 | 21,982 | |
| 1936 | D | 11,994 | 7,607 | 19,844 | |
| 1932 | R | 7,221 | 9,810 | 17,629 | |
| 1928 | R | 4,716 | 10,879 | 15,811 | |
| 1924 | R | 845 | 9,771 | 13,820 | |
| 1920 | R | 3,012 | 9,233 | 13,103 | |
| 1916 | R | 2,625 | 5,263 | 8,330 | |
| 1912 | R | 997 | 2,603 | 7,822 | |
| 1908 | R | 1,275 | 5,613 | 7,506 | |
| 1904 | R | 785 | 5,654 | 6,817 | |
| 1900 | R | 1,471 | 5,235 | 6,932 | |
| 1896 | R | 1,980 | 5,111 | 7,290 | |
| 1892 | R | 2,850 | 3,874 | 7,305 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Marquette County anchors Michigan's Upper Peninsula with a university town at its core — Northern Michigan University's enrollment shapes a younger, more educated electorate that has kept the county reliably center-left even as surrounding U.P. counties moved sharply rightward.
The Democratic margin in Marquette County reached its widest at thirty-six points in 1964. The margin in 2024 was nine points — still decisive.
Marquette County's loyalty is rooted in its place. Median household income of $65,429, a 91% non-Hispanic-white share, and a population of 67,112 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 St. Clair County and Clatsop County.
