| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 5,137 | 4,896 | 10,152 | |
| 2020 | D | 6,290 | 5,044 | 11,446 | |
| 2016 | D | 5,954 | 4,267 | 10,389 | |
| 2012 | D | 6,100 | 3,676 | 9,853 | |
| 2008 | D | 6,794 | 3,996 | 10,876 | |
| 2004 | D | 4,984 | 3,423 | 8,560 | |
| 2000 | D | 5,060 | 2,699 | 7,883 | |
| 1996 | D | 5,348 | 2,148 | 8,027 | |
| 1992 | D | 5,111 | 2,526 | 8,570 | |
| 1988 | D | 3,937 | 2,921 | 6,870 | |
| 1984 | D | 4,294 | 3,951 | 8,283 | |
| 1980 | D | 5,378 | 2,585 | 8,040 | |
| 1976 | D | 5,409 | 1,961 | 7,377 | |
| 1972 | R | 1,999 | 3,838 | 5,852 | |
| 1968 | D | 2,294 | 2,024 | 6,458 | |
| 1964 | D | 2,422 | 1,864 | 4,286 | |
| 1960 | D | 2,586 | 1,291 | 3,877 | |
| 1956 | D | 1,769 | 507 | 2,798 | |
| 1952 | D | 1,699 | 1,541 | 3,240 | |
| 1948 | D | 354 | 41 | 1,479 | |
| 1944 | D | 874 | 34 | 979 | |
| 1940 | D | 526 | 13 | 539 | |
| 1936 | D | 988 | 0 | 995 | |
| 1932 | D | 685 | 0 | 707 | |
| 1928 | D | 729 | 27 | 756 | |
| 1924 | D | 716 | 0 | 716 | |
| 1920 | D | 960 | 5 | 965 | |
| 1916 | D | 1,071 | 2 | 1,088 | |
| 1912 | D | 719 | 0 | 719 | |
| 1908 | D | 917 | 16 | 933 | |
| 1904 | D | 755 | 14 | 769 | |
| 1900 | D | 714 | 35 | 749 | |
| 1896 | D | 1,232 | 237 | 1,472 | |
| 1892 | D | 1,004 | 262 | 1,437 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Marlboro County's electorate reflects the demographic tension common to majority-Black rural counties in the Pee Dee region, where Democratic margins have compressed steadily over successive presidential cycles despite a Black share of the population near 50%.
The Democratic margin in Marlboro County reached its widest at 100 points in 1912. The margin in 2024 was two points — still decisive.
Marlboro County's loyalty is rooted in its place. Median household income of $34,301, a 39% non-Hispanic-white share, and a population of 25,975 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Hampton County and Surry County.
