| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 12,275 | 18,229 | 31,085 | |
| 2020 | R | 14,479 | 18,827 | 33,712 | |
| 2016 | R | 11,904 | 16,381 | 29,853 | |
| 2012 | D | 14,719 | 14,334 | 29,623 | |
| 2008 | D | 16,044 | 14,816 | 31,363 | |
| 2004 | R | 13,749 | 15,721 | 29,781 | |
| 2000 | D | 13,718 | 12,257 | 26,972 | |
| 1996 | D | 12,044 | 9,294 | 25,992 | |
| 1992 | R | 10,062 | 10,363 | 27,935 | |
| 1988 | R | 9,956 | 15,240 | 25,606 | |
| 1984 | R | 8,935 | 17,368 | 26,452 | |
| 1980 | R | 10,209 | 13,000 | 25,474 | |
| 1976 | D | 12,826 | 11,639 | 24,977 | |
| 1972 | R | 8,609 | 16,371 | 25,249 | |
| 1968 | R | 11,172 | 11,407 | 26,251 | |
| 1964 | D | 17,846 | 8,682 | 26,545 | |
| 1960 | R | 12,394 | 14,192 | 26,607 | |
| 1956 | R | 9,276 | 14,091 | 23,423 | |
| 1952 | R | 11,362 | 12,026 | 23,442 | |
| 1948 | D | 9,278 | 8,961 | 18,418 | |
| 1944 | D | 10,345 | 7,942 | 18,310 | |
| 1940 | D | 12,244 | 8,132 | 20,433 | |
| 1936 | D | 11,614 | 7,671 | 19,402 | |
| 1932 | R | 7,357 | 9,870 | 17,425 | |
| 1928 | R | 3,001 | 12,323 | 15,360 | |
| 1924 | R | 3,206 | 8,027 | 11,657 | |
| 1920 | R | 3,483 | 7,638 | 11,485 | |
| 1916 | R | 3,353 | 4,080 | 7,588 | |
| 1912 | D | 2,745 | 1,803 | 6,081 | |
| 1908 | R | 3,173 | 3,713 | 7,017 | |
| 1904 | R | 2,775 | 3,694 | 6,750 | |
| 1900 | R | 2,981 | 3,398 | 6,710 | |
| 1896 | R | 2,802 | 3,717 | 6,836 | |
| 1892 | D | 3,237 | 3,152 | 6,700 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Salem County's agricultural flatlands and small manufacturing towns anchor a voter base that has moved Republican by double digits over the past two presidential cycles, reaching R+19.2 in 2024.
The county's recent history is a story of close margins. The Democratic margin reached thirty-five points in 1964; the Republican margin reached sixty-one points in 1928. Most other elections have been decided by single-digit points.
Salem County's demographics — a population of 65,275, a 73% non-Hispanic-white share, a median household income of $79,960 — 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 Somerset County and Macomb County.
