| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 26,577 | 28,675 | 55,952 | |
| 2020 | D | 32,742 | 28,952 | 62,091 | |
| 2016 | D | 27,771 | 24,453 | 54,331 | |
| 2012 | D | 34,055 | 20,658 | 55,369 | |
| 2008 | D | 34,919 | 22,360 | 58,065 | |
| 2004 | D | 27,875 | 24,362 | 53,185 | |
| 2000 | D | 28,188 | 18,882 | 48,684 | |
| 1996 | D | 25,444 | 14,744 | 46,533 | |
| 1992 | D | 22,220 | 19,253 | 52,116 | |
| 1988 | R | 21,869 | 26,024 | 48,349 | |
| 1984 | R | 21,141 | 29,398 | 51,155 | |
| 1980 | R | 19,356 | 23,242 | 46,403 | |
| 1976 | D | 29,165 | 20,535 | 50,287 | |
| 1972 | R | 18,692 | 26,409 | 45,392 | |
| 1968 | D | 21,661 | 18,388 | 45,488 | |
| 1964 | D | 33,593 | 12,611 | 46,215 | |
| 1960 | D | 23,199 | 21,283 | 44,512 | |
| 1956 | R | 17,309 | 24,067 | 41,444 | |
| 1952 | R | 18,929 | 21,819 | 40,859 | |
| 1948 | R | 15,195 | 16,556 | 32,313 | |
| 1944 | D | 15,674 | 14,477 | 30,218 | |
| 1940 | D | 19,251 | 16,322 | 35,680 | |
| 1936 | D | 20,492 | 14,500 | 35,292 | |
| 1932 | R | 12,371 | 16,668 | 29,971 | |
| 1928 | R | 6,694 | 23,921 | 30,699 | |
| 1924 | R | 4,780 | 15,691 | 22,084 | |
| 1920 | R | 4,487 | 11,913 | 17,427 | |
| 1916 | R | 4,573 | 5,692 | 10,917 | |
| 1912 | D | 3,858 | 1,895 | 10,424 | |
| 1908 | R | 4,521 | 6,770 | 11,970 | |
| 1904 | R | 3,317 | 7,402 | 11,485 | |
| 1900 | R | 4,036 | 6,780 | 11,562 | |
| 1896 | R | 3,877 | 7,018 | 11,488 | |
| 1892 | R | 4,732 | 5,517 | 11,063 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Cumberland's blend of agricultural communities, a majority-minority population, and persistent economic hardship makes it one of New Jersey's genuine swing counties — its R+3.8 margin in 2024 reversed a Democratic lean held through much of the prior decade.
The Democratic margin in Cumberland County reached its widest at forty-five points in 1964. The margin in 2024 was four points — a notable narrowing.
Cumberland County's loyalty is rooted in its place. Median household income of $67,436, a 47% non-Hispanic-white share, and a population of 153,305 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 Atlantic County and Clinton County.
