| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 5,335 | 20,844 | 26,600 | |
| 2020 | R | 5,446 | 19,528 | 25,383 | |
| 2016 | R | 4,883 | 18,110 | 24,128 | |
| 2012 | R | 6,528 | 15,394 | 22,356 | |
| 2008 | R | 7,123 | 14,886 | 22,217 | |
| 2004 | R | 6,596 | 14,231 | 20,969 | |
| 2000 | R | 6,020 | 11,452 | 17,650 | |
| 1996 | R | 6,269 | 8,318 | 16,439 | |
| 1992 | R | 5,116 | 6,974 | 15,567 | |
| 1988 | R | 5,066 | 8,195 | 13,309 | |
| 1984 | R | 4,920 | 9,149 | 14,132 | |
| 1980 | R | 5,135 | 7,467 | 13,249 | |
| 1976 | D | 6,348 | 6,176 | 12,595 | |
| 1972 | R | 4,137 | 7,689 | 11,885 | |
| 1968 | R | 4,842 | 6,208 | 12,760 | |
| 1964 | D | 7,699 | 5,473 | 13,198 | |
| 1960 | R | 6,216 | 7,619 | 13,854 | |
| 1956 | R | 5,535 | 7,189 | 12,746 | |
| 1952 | R | 5,810 | 7,091 | 12,934 | |
| 1948 | D | 6,040 | 5,353 | 11,462 | |
| 1944 | R | 5,157 | 5,487 | 10,691 | |
| 1940 | D | 6,038 | 5,908 | 11,987 | |
| 1936 | D | 6,366 | 4,669 | 11,256 | |
| 1932 | D | 6,429 | 4,716 | 11,275 | |
| 1928 | R | 4,459 | 6,334 | 10,829 | |
| 1924 | R | 4,330 | 4,588 | 9,536 | |
| 1920 | R | 4,884 | 5,159 | 10,183 | |
| 1916 | D | 3,010 | 2,318 | 5,495 | |
| 1912 | D | 2,957 | 1,366 | 5,268 | |
| 1908 | D | 3,365 | 2,520 | 6,027 | |
| 1904 | D | 3,264 | 2,588 | 6,020 | |
| 1900 | D | 3,371 | 2,533 | 6,031 | |
| 1896 | D | 3,313 | 2,714 | 6,065 | |
| 1892 | D | 3,397 | 2,274 | 5,801 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Dearborn sits in Indiana's southeastern corner along the Ohio River, where rural demographics and a manufacturing heritage have produced presidential margins exceeding 58 points in 2024, among the widest in the state.
The Republican margin in Dearborn County reached its widest at fifty-eight points in 2024. The margin in 2024 was fifty-eight points, in line with the county's deep historical pattern.
Dearborn County's loyalty is rooted in its place. Median household income of $84,735, a 95% non-Hispanic-white share, and a population of 51,094 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 Doddridge County and Ritchie County.
