| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 31,298 | 53,592 | 86,091 | |
| 2020 | R | 32,275 | 51,589 | 85,185 | |
| 2016 | R | 25,455 | 46,025 | 74,851 | |
| 2012 | R | 25,322 | 44,042 | 70,363 | |
| 2008 | R | 26,101 | 42,849 | 69,770 | |
| 2004 | R | 19,799 | 39,077 | 59,492 | |
| 2000 | R | 16,409 | 33,203 | 50,782 | |
| 1996 | R | 14,314 | 26,539 | 43,074 | |
| 1992 | R | 14,802 | 25,731 | 46,778 | |
| 1988 | R | 10,598 | 27,665 | 38,507 | |
| 1984 | R | 9,892 | 25,872 | 36,133 | |
| 1980 | R | 13,014 | 18,570 | 32,369 | |
| 1976 | R | 14,927 | 16,011 | 31,173 | |
| 1972 | R | 5,745 | 21,117 | 27,407 | |
| 1968 | R | 6,319 | 12,264 | 27,398 | |
| 1964 | R | 7,622 | 17,467 | 25,089 | |
| 1960 | R | 6,674 | 10,715 | 17,389 | |
| 1956 | R | 4,280 | 6,195 | 12,296 | |
| 1952 | D | 4,346 | 4,282 | 8,628 | |
| 1948 | D | 572 | 115 | 5,299 | |
| 1944 | D | 2,403 | 60 | 2,633 | |
| 1940 | D | 2,772 | 89 | 2,861 | |
| 1936 | D | 3,298 | 0 | 3,333 | |
| 1932 | D | 3,346 | 0 | 3,393 | |
| 1928 | D | 1,308 | 242 | 1,553 | |
| 1924 | D | 1,488 | 16 | 1,509 | |
| 1920 | D | 1,649 | 64 | 1,713 | |
| 1916 | D | 1,750 | 26 | 1,787 | |
| 1912 | D | 1,452 | 0 | 1,458 | |
| 1908 | D | 1,990 | 48 | 2,038 | |
| 1904 | D | 1,672 | 35 | 1,707 | |
| 1900 | D | 1,470 | 53 | 1,523 | |
| 1896 | D | 1,819 | 137 | 1,967 | |
| 1892 | D | 1,802 | 396 | 2,268 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Aiken's economy revolves around the Savannah River Site, a federal nuclear facility that draws a highly educated technical workforce — a demographic that has nonetheless not softened the county's consistent Republican margins, which held above 25 points in 2024.
The shift began with civil rights. 1956 marked the realignment in Aiken County, by a sixteen points margin. The Republican margin reached its widest at fifty-six points in 1972. The 2024 margin was twenty-six points.
The political shift has tracked, in Aiken County, the political shift of the South more broadly. A 65% non-Hispanic-white share, a median household income of $70,609, and a 14% poverty rate describe the demographic context. The county's voting pattern over the last decade is most similar to that of Lexington County and Greenville County.
