Marlboro County's 2026 population is estimated at 24,950, reflecting a -1.09% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Marlboro County is the 36th largest county in South Carolina. The 2010 population was 28,918 and has grown -13.72% since 2010.
Data after 2023 is projected based on recent change
Overall: 41.7 years
Female: 44.8 years
Male: 40.1 years
There are 20,804 adults, (4,959 of whom are seniors) in Marlboro County.
Female: 12,290 (47.3%)
Male: 13,685 (52.7%)
The racial composition of Marlboro County includes 47.85% Black or African American, 39.19% White, 3.03% Native American, and smaller percentages for other race, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Black or African American | 12,429 | 47.85% |
| White | 10,179 | 39.19% |
| Two or more races | 2,064 | 7.95% |
| Native American | 786 | 3.03% |
| Other race | 410 | 1.58% |
| Asian | 107 | 0.41% |
Marlboro County 's average per capita income is $32,058. Household income levels show a median of $34,301. The poverty rate stands at 28.51%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $69,475 | - |
| Families | $54,353 | $68,613 |
| Households | $34,301 | $51,818 |
| Non Families | $20,106 | $30,962 |
Average Income
Median Household Income
Poverty Rate