| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 61,879 | 65,817 | 130,209 | |
| 2020 | D | 73,808 | 64,438 | 139,204 | |
| 2016 | D | 60,924 | 52,690 | 118,041 | |
| 2012 | D | 65,600 | 46,522 | 113,344 | |
| 2008 | D | 67,830 | 49,902 | 119,042 | |
| 2004 | D | 55,746 | 49,487 | 106,097 | |
| 2000 | D | 52,880 | 35,593 | 91,102 | |
| 1996 | D | 44,434 | 29,538 | 83,601 | |
| 1992 | D | 39,633 | 34,279 | 90,298 | |
| 1988 | R | 34,047 | 44,748 | 79,442 | |
| 1984 | R | 33,240 | 49,158 | 82,851 | |
| 1980 | R | 31,286 | 37,973 | 76,202 | |
| 1976 | D | 41,965 | 36,733 | 80,630 | |
| 1972 | R | 28,203 | 45,667 | 76,700 | |
| 1968 | D | 35,581 | 32,807 | 77,834 | |
| 1964 | D | 50,945 | 25,626 | 78,019 | |
| 1960 | R | 36,129 | 39,158 | 76,969 | |
| 1956 | R | 21,668 | 44,698 | 68,038 | |
| 1952 | R | 28,953 | 40,259 | 69,375 | |
| 1948 | R | 25,313 | 31,608 | 58,071 | |
| 1944 | D | 28,972 | 25,593 | 54,794 | |
| 1940 | D | 36,155 | 30,551 | 66,798 | |
| 1936 | D | 39,605 | 24,680 | 64,688 | |
| 1932 | R | 28,071 | 31,264 | 60,261 | |
| 1928 | R | 19,152 | 37,238 | 56,465 | |
| 1924 | R | 6,937 | 27,936 | 37,939 | |
| 1920 | R | 5,753 | 21,245 | 27,725 | |
| 1916 | R | 5,467 | 9,713 | 15,447 | |
| 1912 | D | 4,885 | 4,422 | 13,963 | |
| 1908 | R | 4,577 | 8,822 | 13,847 | |
| 1904 | R | 3,064 | 7,933 | 11,247 | |
| 1900 | R | 2,566 | 6,122 | 9,046 | |
| 1896 | R | 2,233 | 5,005 | 7,576 | |
| 1892 | R | 3,003 | 3,329 | 6,632 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Atlantic County anchors New Jersey's casino and hospitality corridor, and its electorate has shifted rightward over the past decade, flipping from a Democratic-leaning county to one that backed the Republican presidential candidate by roughly three points in 2024.
The county's recent history is a story of close margins. The Democratic margin reached thirty-two points in 1964; the Republican margin reached fifty-six points in 1920. Most other elections have been decided by single-digit points.
Atlantic County's demographics — a population of 276,270, a 56% non-Hispanic-white share, a median household income of $78,050 — 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 Cumberland County and Nassau County.