| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 380,518 | 210,830 | 604,184 | |
| 2020 | D | 409,144 | 211,237 | 630,577 | |
| 2016 | D | 351,198 | 199,331 | 593,435 | |
| 2012 | D | 346,373 | 215,997 | 574,610 | |
| 2008 | D | 334,709 | 218,486 | 561,763 | |
| 2004 | D | 285,801 | 237,253 | 525,827 | |
| 2000 | D | 202,018 | 197,862 | 414,074 | |
| 1996 | D | 192,795 | 178,412 | 400,515 | |
| 1992 | R | 176,656 | 186,324 | 444,801 | |
| 1988 | R | 147,585 | 226,265 | 377,357 | |
| 1984 | R | 131,530 | 250,360 | 390,474 | |
| 1980 | R | 143,932 | 200,948 | 373,045 | |
| 1976 | R | 141,624 | 189,645 | 340,712 | |
| 1972 | R | 117,562 | 219,771 | 344,808 | |
| 1968 | R | 101,240 | 148,933 | 287,624 | |
| 1964 | D | 154,527 | 131,345 | 285,872 | |
| 1960 | R | 110,283 | 161,178 | 271,461 | |
| 1956 | R | 78,852 | 151,544 | 230,396 | |
| 1952 | R | 91,620 | 138,894 | 230,514 | |
| 1948 | R | 84,806 | 98,707 | 184,999 | |
| 1944 | R | 89,394 | 99,292 | 188,686 | |
| 1940 | D | 96,601 | 92,533 | 189,134 | |
| 1936 | D | 90,746 | 63,830 | 158,047 | |
| 1932 | R | 58,539 | 67,957 | 130,160 | |
| 1928 | R | 47,084 | 92,019 | 139,712 | |
| 1924 | R | 26,505 | 61,891 | 107,295 | |
| 1920 | R | 48,452 | 59,691 | 110,064 | |
| 1916 | D | 34,103 | 24,107 | 59,727 | |
| 1912 | D | 20,697 | 12,791 | 50,715 | |
| 1908 | R | 23,314 | 28,914 | 54,097 | |
| 1904 | R | 15,502 | 27,439 | 44,622 | |
| 1900 | R | 19,809 | 22,237 | 42,636 | |
| 1896 | R | 18,320 | 20,291 | 39,053 | |
| 1892 | D | 15,495 | 14,341 | 30,835 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Franklin County anchors Ohio's capital and largest city, producing Democratic presidential margins above 25 points in each of the last three cycles. Its rapid population growth, driven by a major research university and healthcare sector, has steadily widened that gap.
The Democratic margin in Franklin County has been steady. It reached its modern peak at thirty-one points in 2020; the 2024 margin was twenty-eight points, still in line with the county's long pattern.
Franklin County's political identity is inseparable from its demographic profile: a 59% non-Hispanic-white share, a median household income of $75,176, and the full diversity of a major metropolitan center. The county's voting pattern resembles other major urban centers most closely — Mecklenburg County and Montgomery County.