| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 25,767 | 34,792 | 61,338 | |
| 2020 | R | 26,151 | 33,125 | 60,255 | |
| 2016 | R | 21,642 | 28,328 | 53,274 | |
| 2012 | D | 27,877 | 24,911 | 53,586 | |
| 2008 | D | 32,589 | 23,795 | 57,428 | |
| 2004 | D | 31,049 | 25,448 | 57,059 | |
| 2000 | D | 28,251 | 22,150 | 51,636 | |
| 1996 | D | 27,835 | 16,038 | 49,603 | |
| 1992 | D | 26,492 | 16,383 | 54,355 | |
| 1988 | D | 28,225 | 20,710 | 49,152 | |
| 1984 | R | 22,597 | 26,198 | 49,030 | |
| 1980 | R | 24,517 | 25,331 | 54,592 | |
| 1976 | D | 25,958 | 23,174 | 49,689 | |
| 1972 | R | 21,712 | 23,094 | 46,118 | |
| 1968 | D | 21,410 | 18,779 | 42,567 | |
| 1964 | D | 29,754 | 11,896 | 41,706 | |
| 1960 | D | 22,998 | 20,909 | 44,011 | |
| 1956 | R | 15,301 | 23,519 | 38,948 | |
| 1952 | R | 14,113 | 20,087 | 34,396 | |
| 1948 | D | 14,349 | 13,321 | 27,997 | |
| 1944 | D | 15,602 | 15,459 | 31,204 | |
| 1940 | D | 14,902 | 14,618 | 29,587 | |
| 1936 | D | 13,789 | 8,729 | 24,885 | |
| 1932 | D | 14,708 | 9,816 | 25,092 | |
| 1928 | R | 9,395 | 12,467 | 21,917 | |
| 1924 | R | 5,881 | 14,861 | 22,951 | |
| 1920 | R | 7,011 | 13,933 | 21,460 | |
| 1916 | R | 5,996 | 6,708 | 13,130 | |
| 1912 | D | 2,990 | 2,625 | 11,205 | |
| 1908 | R | 4,223 | 6,760 | 11,611 | |
| 1904 | R | 3,142 | 7,609 | 11,148 | |
| 1900 | R | 5,081 | 6,462 | 11,836 | |
| 1896 | D | 6,296 | 6,037 | 12,553 | |
| 1892 | D | 5,714 | 4,587 | 10,678 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Bay County's blue-collar manufacturing heritage once made it a reliable Democratic anchor on Saginaw Bay, but the county has moved roughly 20 points rightward over the past decade, mirroring broader shifts among working-class voters in the Great Lakes region.
The Democratic margin in Bay County has rarely exceeded forty-three points in modern history; the Republican margin has rarely exceeded forty points. 2024 delivered the county to the Republican candidate by fifteen points.
Bay County's demographics resemble the country more than they resemble most counties. A 91% non-Hispanic-white share, a 13% poverty rate, and a median household income of $61,763 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Columbia County and Lee County.
