Sumter County's 2026 population is estimated at 105,508, reflecting a 0.35% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Sumter County is the 16th largest county in South Carolina. The 2010 population was 107,610 and has grown -1.95% since 2010.
Data after 2023 is projected based on recent change
Overall: 38 years
Female: 39.7 years
Male: 34.6 years
There are 79,902 adults, (18,606 of whom are seniors) in Sumter County.
Female: 54,164 (51.7%)
Male: 50,561 (48.3%)
The racial composition of Sumter County includes 45.96% Black or African American, 44.86% White, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Black or African American | 48,127 | 45.96% |
| White | 46,981 | 44.86% |
| Two or more races | 5,326 | 5.09% |
| Other race | 2,022 | 1.93% |
| Asian | 1,553 | 1.48% |
| Native American | 568 | 0.54% |
| Native Hawaiian or Pacific Islander | 148 | 0.14% |
Sumter County 's average per capita income is $43,956. Household income levels show a median of $56,693. The poverty rate stands at 16.56%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $90,715 | - |
| Families | $72,914 | $91,094 |
| Households | $56,693 | $74,835 |
| Non Families | $31,917 | $43,504 |
Average Income
Median Household Income
Poverty Rate