| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 22,450 | 26,751 | 50,074 | |
| 2020 | R | 21,968 | 25,098 | 47,927 | |
| 2016 | R | 16,492 | 21,636 | 40,937 | |
| 2012 | R | 18,191 | 20,650 | 39,235 | |
| 2008 | D | 20,005 | 19,726 | 40,381 | |
| 2004 | R | 15,483 | 21,989 | 37,807 | |
| 2000 | R | 13,394 | 18,054 | 32,199 | |
| 1996 | R | 11,945 | 13,694 | 28,601 | |
| 1992 | R | 10,116 | 12,216 | 30,339 | |
| 1988 | R | 9,225 | 15,497 | 24,837 | |
| 1984 | R | 6,226 | 17,387 | 23,726 | |
| 1980 | R | 7,539 | 14,968 | 24,691 | |
| 1976 | R | 7,549 | 13,475 | 21,353 | |
| 1972 | R | 5,870 | 13,438 | 19,653 | |
| 1968 | R | 5,548 | 9,416 | 16,585 | |
| 1964 | D | 8,932 | 5,891 | 14,837 | |
| 1960 | R | 4,822 | 10,227 | 15,072 | |
| 1956 | R | 3,673 | 10,770 | 14,474 | |
| 1952 | R | 2,977 | 10,510 | 13,566 | |
| 1948 | R | 2,523 | 7,510 | 10,191 | |
| 1944 | R | 2,533 | 8,422 | 10,984 | |
| 1940 | R | 2,745 | 8,311 | 11,081 | |
| 1936 | R | 4,296 | 4,915 | 9,823 | |
| 1932 | D | 5,098 | 4,647 | 9,853 | |
| 1928 | R | 2,013 | 6,161 | 8,210 | |
| 1924 | R | 1,359 | 6,637 | 8,641 | |
| 1920 | R | 1,464 | 6,019 | 7,628 | |
| 1916 | R | 2,094 | 3,381 | 5,579 | |
| 1912 | D | 1,723 | 1,723 | 5,389 | |
| 1908 | R | 2,188 | 3,490 | 5,853 | |
| 1904 | R | 2,068 | 4,095 | 6,339 | |
| 1900 | R | 2,928 | 3,795 | 6,890 | |
| 1896 | R | 3,467 | 3,480 | 7,110 | |
| 1892 | R | 2,756 | 3,133 | 6,470 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Clinton County sits between Lansing's urban core and Michigan's rural interior, a mix that once made it competitive but has shifted toward consistent Republican margins as its exurban character has deepened.
The county's recent history is a story of close margins. The Democratic margin reached twenty points in 1964; the Republican margin reached sixty-one points in 1924. Most other elections have been decided by single-digit points.
Clinton County's demographics — a population of 79,626, a 89% non-Hispanic-white share, a median household income of $88,210 — 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 Carson City and Spotsylvania County.
