| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 8,866 | 14,872 | 24,042 | |
| 2020 | R | 9,008 | 14,628 | 24,007 | |
| 2016 | R | 8,285 | 12,653 | 22,678 | |
| 2012 | D | 11,503 | 10,538 | 22,736 | |
| 2008 | D | 12,064 | 10,624 | 23,090 | |
| 2004 | R | 11,118 | 12,073 | 23,259 | |
| 2000 | R | 9,485 | 9,917 | 19,968 | |
| 1996 | D | 9,321 | 6,991 | 18,888 | |
| 1992 | D | 8,128 | 6,782 | 19,795 | |
| 1988 | R | 8,038 | 9,352 | 17,517 | |
| 1984 | R | 7,053 | 10,920 | 18,075 | |
| 1980 | R | 6,753 | 8,641 | 16,883 | |
| 1976 | D | 9,646 | 8,241 | 18,299 | |
| 1972 | R | 6,465 | 9,772 | 16,889 | |
| 1968 | R | 6,319 | 7,149 | 15,115 | |
| 1964 | D | 9,618 | 5,639 | 15,257 | |
| 1960 | R | 6,612 | 9,260 | 15,872 | |
| 1956 | R | 5,176 | 8,806 | 13,982 | |
| 1952 | R | 5,808 | 8,708 | 14,516 | |
| 1948 | D | 6,157 | 5,591 | 11,783 | |
| 1944 | R | 4,941 | 6,922 | 11,863 | |
| 1940 | R | 5,556 | 6,872 | 12,428 | |
| 1936 | D | 6,335 | 4,006 | 11,139 | |
| 1932 | D | 6,817 | 3,600 | 10,532 | |
| 1928 | R | 3,435 | 5,772 | 9,229 | |
| 1924 | R | 2,571 | 4,137 | 7,991 | |
| 1920 | R | 2,867 | 4,336 | 7,299 | |
| 1916 | D | 3,347 | 1,793 | 5,194 | |
| 1912 | D | 2,728 | 791 | 4,611 | |
| 1908 | D | 3,329 | 2,202 | 5,577 | |
| 1904 | D | 2,706 | 2,437 | 5,194 | |
| 1900 | D | 3,185 | 2,131 | 5,345 | |
| 1896 | D | 3,260 | 2,079 | 5,373 | |
| 1892 | D | 2,943 | 1,588 | 4,620 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Ottawa County sits along Lake Erie's western basin, where seasonal tourism and commercial fishing shape local economic life. Despite its small size, it draws outsized attention as a bellwether that has tracked closely with statewide Republican margins over recent cycles.
The Republican margin in Ottawa County reached its widest at twenty-six points in 1956. The margin in 2024 was twenty-five points, in line with the county's deep historical pattern.
Ottawa County's loyalty is rooted in its place. Median household income of $76,101, a 92% non-Hispanic-white share, and a population of 39,994 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 Shiawassee County and Juneau County.
