Marion County's estimated 2026 population is 27,980 with a growth rate of -0.93% in the past year according to the most recent United States census data. Marion County is the 33rd largest county in South Carolina. The 2010 population was 32,951 and has seen a growth of -15.09% since that time.
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