| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 42,374 | 33,163 | 76,690 | |
| 2020 | D | 41,721 | 30,489 | 73,805 | |
| 2016 | D | 34,894 | 29,072 | 69,000 | |
| 2012 | D | 36,026 | 26,729 | 63,969 | |
| 2008 | D | 37,990 | 25,021 | 63,549 | |
| 2004 | D | 32,942 | 25,825 | 59,281 | |
| 2000 | D | 25,400 | 21,108 | 49,393 | |
| 1996 | D | 23,475 | 14,484 | 42,843 | |
| 1992 | D | 21,247 | 16,028 | 47,539 | |
| 1988 | R | 16,547 | 20,636 | 37,698 | |
| 1984 | R | 12,752 | 20,452 | 33,356 | |
| 1980 | R | 11,041 | 16,399 | 32,531 | |
| 1976 | R | 14,566 | 14,569 | 29,365 | |
| 1972 | R | 12,028 | 16,846 | 29,129 | |
| 1968 | D | 13,129 | 12,427 | 26,283 | |
| 1964 | D | 17,737 | 8,342 | 26,079 | |
| 1960 | D | 14,335 | 13,539 | 27,874 | |
| 1956 | R | 9,659 | 15,494 | 25,160 | |
| 1952 | R | 11,753 | 13,729 | 25,482 | |
| 1948 | D | 11,603 | 9,988 | 21,776 | |
| 1944 | D | 12,497 | 9,388 | 21,898 | |
| 1940 | D | 12,847 | 8,996 | 21,843 | |
| 1936 | D | 11,005 | 8,215 | 19,697 | |
| 1932 | D | 9,970 | 9,060 | 19,098 | |
| 1928 | R | 7,441 | 10,470 | 17,939 | |
| 1924 | R | 6,445 | 9,167 | 16,187 | |
| 1920 | R | 5,643 | 8,700 | 14,412 | |
| 1916 | D | 4,040 | 4,037 | 8,142 | |
| 1912 | D | 3,468 | 2,962 | 7,866 | |
| 1908 | R | 3,523 | 4,822 | 8,573 | |
| 1904 | R | 3,553 | 4,869 | 8,605 | |
| 1900 | R | 3,792 | 4,987 | 9,015 | |
| 1896 | R | 2,259 | 5,483 | 7,995 | |
| 1892 | R | 4,229 | 4,666 | 9,029 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Anchored by Durham's University of New Hampshire campus and the small city of Dover, Strafford County combines a large student population with working-class mill-town voters, producing a consistent Democratic margin in statewide contests.
The Democratic margin in Strafford County reached its widest at thirty-six points in 1964. The margin in 2024 was twelve points — still decisive.
Strafford County's loyalty is rooted in its place. Median household income of $88,570, a 88% non-Hispanic-white share, and a population of 132,575 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 Cheshire County and Southeastern Connecticut Planning Region.
