| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 6,954 | 9,390 | 16,772 | |
| 2020 | R | 6,857 | 8,764 | 15,977 | |
| 2016 | R | 6,245 | 8,413 | 15,104 | |
| 2012 | R | 7,257 | 7,976 | 15,444 | |
| 2008 | R | 6,912 | 8,168 | 15,274 | |
| 2004 | R | 5,411 | 7,801 | 13,339 | |
| 2000 | R | 5,232 | 5,847 | 11,392 | |
| 1996 | D | 4,613 | 4,337 | 10,054 | |
| 1992 | R | 3,933 | 4,934 | 10,957 | |
| 1988 | R | 3,709 | 6,343 | 10,140 | |
| 1984 | R | 3,160 | 6,699 | 9,981 | |
| 1980 | R | 4,908 | 5,160 | 10,550 | |
| 1976 | R | 4,528 | 4,768 | 9,296 | |
| 1972 | R | 2,136 | 6,859 | 9,149 | |
| 1968 | R | 2,714 | 4,183 | 10,114 | |
| 1964 | R | 4,564 | 5,327 | 9,891 | |
| 1960 | D | 4,964 | 4,626 | 9,590 | |
| 1956 | R | 3,733 | 5,809 | 9,542 | |
| 1952 | R | 4,823 | 5,524 | 10,499 | |
| 1948 | D | 4,507 | 3,751 | 8,351 | |
| 1944 | D | 4,764 | 4,241 | 9,005 | |
| 1940 | D | 6,088 | 3,953 | 10,128 | |
| 1936 | D | 5,293 | 3,735 | 9,039 | |
| 1932 | D | 4,547 | 3,466 | 8,052 | |
| 1928 | R | 2,180 | 6,333 | 8,535 | |
| 1924 | R | 3,047 | 3,356 | 6,612 | |
| 1920 | R | 3,950 | 4,218 | 8,210 | |
| 1916 | D | 2,750 | 2,468 | 5,320 | |
| 1912 | D | 5,485 | 2,387 | 5,329 | |
| 1908 | D | 4,869 | 2,769 | 89 | |
| 1904 | D | 6,242 | 2,680 | 102 | |
| 1900 | R | 2,733 | 3,366 | 15 | |
| 1896 | R | 2,638 | 3,048 | 5,835 | |
| 1892 | R | 2,015 | 2,365 | 4,597 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Dorchester's economy has long centered on the Bay's crabbing and farming industries, and its rural, majority-white electorate has shifted steadily rightward over the past two decades, delivering R+14.5 in 2024.
The Republican margin in Dorchester County reached its widest at 100 points in 1900. The margin in 2024 was fifteen points, in line with the county's deep historical pattern.
Dorchester County's loyalty is rooted in its place. Median household income of $61,839, a 62% non-Hispanic-white share, and a population of 32,754 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 Polk County and Cape May County.
