Marion County's 2026 population is estimated at 28,060, reflecting a -0.55% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Marion County is the 33rd largest county in South Carolina. The 2010 population was 32,951 and has grown -14.84% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.6 years
Female: 44.8 years
Male: 39.6 years
There are 22,331 adults, (6,203 of whom are seniors) in Marion County.
Female: 15,226 (53.1%)
Male: 13,438 (46.9%)
The racial composition of Marion County includes 54.9% Black or African American, 39.19% White, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Black or African American | 15,736 | 54.9% |
| White | 11,234 | 39.19% |
| Two or more races | 903 | 3.15% |
| Other race | 574 | 2% |
| Native American | 185 | 0.65% |
| Native Hawaiian or Pacific Islander | 29 | 0.1% |
| Asian | 3 | 0.01% |
Marion County 's average per capita income is $35,114. Household income levels show a median of $36,301. The poverty rate stands at 29.99%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $69,654 | - |
| Families | $48,805 | $61,776 |
| Households | $36,301 | $51,314 |
| Non Families | $22,764 | $36,437 |
Average Income
Median Household Income
Poverty Rate