| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 229,249 | 236,244 | 471,121 | |
| 2020 | D | 252,556 | 233,762 | 492,820 | |
| 2016 | R | 205,704 | 211,672 | 432,695 | |
| 2012 | R | 196,737 | 211,615 | 411,848 | |
| 2008 | R | 202,618 | 210,537 | 415,761 | |
| 2004 | R | 158,610 | 220,190 | 381,061 | |
| 2000 | R | 108,039 | 152,460 | 265,181 | |
| 1996 | R | 112,328 | 126,959 | 254,123 | |
| 1992 | R | 92,098 | 123,631 | 249,926 | |
| 1988 | R | 74,894 | 128,081 | 203,979 | |
| 1984 | R | 77,488 | 128,724 | 206,249 | |
| 1980 | R | 90,466 | 98,664 | 195,554 | |
| 1976 | D | 105,912 | 74,997 | 182,561 | |
| 1972 | R | 46,530 | 122,154 | 169,204 | |
| 1968 | D | 54,834 | 51,585 | 166,978 | |
| 1964 | R | 79,365 | 81,116 | 160,481 | |
| 1960 | D | 70,091 | 59,073 | 129,164 | |
| 1956 | R | 53,127 | 53,481 | 106,608 | |
| 1952 | D | 53,949 | 50,346 | 104,295 | |
| 1948 | D | 28,567 | 15,379 | 59,695 | |
| 1944 | D | 36,867 | 12,220 | 49,087 | |
| 1940 | D | 41,003 | 9,177 | 50,180 | |
| 1936 | D | 25,989 | 5,368 | 31,357 | |
| 1932 | D | 19,038 | 6,096 | 25,134 | |
| 1928 | R | 9,316 | 16,919 | 26,689 | |
| 1924 | D | 5,908 | 3,291 | 11,376 | |
| 1920 | D | 13,650 | 6,628 | 21,257 | |
| 1916 | D | 5,456 | 1,339 | 7,957 | |
| 1912 | D | 3,514 | 243 | 4,669 | |
| 1908 | D | 2,381 | 641 | 3,562 | |
| 1904 | D | 2,011 | 671 | 3,063 | |
| 1900 | D | 1,857 | 773 | 2,788 | |
| 1896 | D | 1,903 | 1,462 | 3,694 | |
| 1892 | D | 1,442 | 0 | 1,515 | |
| 1888 | — | — | — | — | |
| 1884 | R | 1,890 | 3,387 | 5,277 | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Duval County, anchored by Jacksonville, has shifted steadily toward competitive status as a growing Black electorate and an influx of younger, college-educated residents have eroded margins that once made it a reliable anchor of Florida's Republican coalition.
The county's recent history is a story of close margins. The Democratic margin reached ninety-five points in 1892; the Republican margin reached forty-five points in 1972. Most other elections have been decided by single-digit points.
Duval County's demographics — a population of 1,023,153, a 51% non-Hispanic-white share, a median household income of $71,277 — 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 Stafford County and Warren County.
