| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 214,977 | 284,660 | 510,076 | |
| 2020 | R | 223,952 | 263,863 | 494,256 | |
| 2016 | R | 176,317 | 224,665 | 419,312 | |
| 2012 | D | 208,016 | 191,913 | 405,515 | |
| 2008 | D | 223,784 | 187,663 | 419,216 | |
| 2004 | R | 196,160 | 202,166 | 402,410 | |
| 2000 | D | 172,625 | 164,265 | 345,559 | |
| 1996 | D | 151,430 | 120,616 | 306,028 | |
| 1992 | R | 130,732 | 147,795 | 349,238 | |
| 1988 | R | 112,856 | 175,632 | 291,115 | |
| 1984 | R | 97,816 | 194,300 | 293,525 | |
| 1980 | R | 120,125 | 154,155 | 297,119 | |
| 1976 | R | 121,176 | 132,499 | 258,603 | |
| 1972 | R | 82,346 | 147,777 | 235,793 | |
| 1968 | D | 114,552 | 63,139 | 207,577 | |
| 1964 | D | 131,450 | 44,684 | 176,521 | |
| 1960 | D | 105,681 | 61,989 | 168,195 | |
| 1956 | D | 62,816 | 58,337 | 121,419 | |
| 1952 | R | 36,544 | 37,474 | 74,364 | |
| 1948 | D | 25,265 | 21,205 | 47,660 | |
| 1944 | D | 23,506 | 21,305 | 45,135 | |
| 1940 | D | 21,003 | 17,848 | 39,054 | |
| 1936 | D | 17,593 | 9,383 | 29,299 | |
| 1932 | D | 16,539 | 8,649 | 25,984 | |
| 1928 | R | 7,363 | 12,845 | 20,299 | |
| 1924 | R | 3,191 | 11,147 | 15,933 | |
| 1920 | R | 3,023 | 9,735 | 13,161 | |
| 1916 | R | 3,108 | 4,552 | 7,804 | |
| 1912 | D | 2,829 | 2,508 | 7,281 | |
| 1908 | R | 3,138 | 4,472 | 7,876 | |
| 1904 | R | 2,989 | 4,818 | 8,006 | |
| 1900 | R | 3,491 | 4,239 | 7,887 | |
| 1896 | R | 3,400 | 4,153 | 7,803 | |
| 1892 | D | 3,584 | 2,788 | 6,718 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Macomb County's shift from the archetypal Reagan Democrat stronghold to a reliably Republican-leaning suburb north of Detroit tracks one of the most studied realignments in modern presidential politics, with its 2024 margin reaching R+13.7.
The Democratic margin in Macomb County has rarely exceeded forty-nine points in modern history; the Republican margin has rarely exceeded fifty-one points. 2024 delivered the county to the Republican candidate by fourteen points.
Macomb County's demographics resemble the country more than they resemble most counties. A 75% non-Hispanic-white share, a 10% poverty rate, and a median household income of $77,837 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Salem County and Monroe County.