| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 242,507 | 173,041 | 420,818 | |
| 2020 | D | 241,827 | 166,413 | 413,865 | |
| 2016 | D | 166,153 | 146,989 | 330,950 | |
| 2012 | R | 132,509 | 159,855 | 297,356 | |
| 2008 | R | 129,025 | 158,746 | 290,271 | |
| 2004 | R | 81,708 | 160,445 | 244,343 | |
| 2000 | R | 61,434 | 121,756 | 191,111 | |
| 1996 | R | 53,819 | 96,610 | 162,945 | |
| 1992 | R | 44,253 | 81,822 | 150,576 | |
| 1988 | R | 20,948 | 66,372 | 87,940 | |
| 1984 | R | 14,139 | 54,749 | 68,888 | |
| 1980 | R | 21,958 | 27,185 | 51,452 | |
| 1976 | D | 20,838 | 13,912 | 34,750 | |
| 1972 | R | 2,896 | 18,181 | 21,077 | |
| 1968 | R | 3,226 | 5,350 | 17,489 | |
| 1964 | R | 6,705 | 6,823 | 13,531 | |
| 1960 | D | 6,479 | 2,336 | 8,815 | |
| 1956 | D | 5,687 | 1,443 | 7,130 | |
| 1952 | D | 6,026 | 1,015 | 7,041 | |
| 1948 | D | 2,832 | 413 | 3,727 | |
| 1944 | D | 3,339 | 713 | 4,052 | |
| 1940 | D | 4,023 | 728 | 4,771 | |
| 1936 | D | 2,382 | 541 | 2,926 | |
| 1932 | D | 2,616 | 91 | 2,708 | |
| 1928 | R | 970 | 1,062 | 2,032 | |
| 1924 | D | 1,011 | 207 | 1,334 | |
| 1920 | D | 1,645 | 1,140 | 2,785 | |
| 1916 | D | 1,528 | 222 | 2,020 | |
| 1912 | D | 997 | 55 | 1,643 | |
| 1908 | D | 677 | 541 | 1,651 | |
| 1904 | D | 1,219 | 132 | 2,207 | |
| 1900 | D | 1,052 | 373 | 1,658 | |
| 1896 | D | 1,250 | 773 | 2,161 | |
| 1892 | D | 1,572 | 253 | 2,751 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Gwinnett's rapid demographic transformation — driven by one of the country's most diverse immigrant populations — turned a reliably Republican Atlanta exurb into a double-digit Democratic county by 2020, a shift that continues to reshape statewide math.
The Democratic margin in Gwinnett County has rarely exceeded ninety-three points in modern history; the Republican margin has rarely exceeded seventy-three points. 2024 delivered the county to the Democratic candidate by seventeen points.
Gwinnett County's demographics resemble the country more than they resemble most counties. A 33% non-Hispanic-white share, a 11% poverty rate, and a median household income of $87,890 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Cobb County and Frederick County.
