Williamsburg County's 2026 population is estimated at 29,539, reflecting a -0.55% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Williamsburg County is the 32nd largest county in South Carolina. The 2010 population was 34,342 and has grown -13.99% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.2 years
Female: 46.8 years
Male: 40.1 years
There are 24,400 adults, (6,867 of whom are seniors) in Williamsburg County.
Female: 15,485 (51.1%)
Male: 14,797 (48.9%)
The racial composition of Williamsburg County includes 63.35% Black or African American, 32.86% White, and smaller percentages for Two or more races, other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Black or African American | 19,185 | 63.35% |
| White | 9,950 | 32.86% |
| Two or more races | 446 | 1.47% |
| Other race | 318 | 1.05% |
| Asian | 238 | 0.79% |
| Native American | 145 | 0.48% |
Williamsburg County 's average per capita income is $37,062. Household income levels show a median of $46,213. The poverty rate stands at 23.33%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $70,167 | - |
| Families | $59,415 | $75,909 |
| Households | $46,213 | $59,459 |
| Non Families | $20,605 | $32,142 |
Average Income
Median Household Income
Poverty Rate