San Sebastián Municipio's 2026 population is estimated at 38,177, reflecting a -0.65% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). San Sebastián Municipio is the 23rd largest county in Puerto Rico. The 2010 population was 42,347 and has grown -9.85% since 2010.
Data after 2023 is projected based on recent change
Overall: 47 years
Female: 49 years
Male: 45.3 years
There are 32,769 adults, (10,237 of whom are seniors) in San Sebastián Municipio.
Female: 20,150 (51.6%)
Male: 18,938 (48.4%)
The racial composition of San Sebastián Municipio includes 65.56% White, 20.34% other race, and smaller percentages for Black or African American, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 25,625 | 65.56% |
| Other race | 7,951 | 20.34% |
| Two or more races | 4,768 | 12.2% |
| Black or African American | 689 | 1.76% |
| Native American | 55 | 0.14% |
San Sebastián Municipio 's average per capita income is $18,491. Household income levels show a median of $19,920. The poverty rate stands at 49.69%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $31,812 | - |
| Families | $25,695 | $34,525 |
| Households | $19,920 | $29,634 |
| Non Families | $12,026 | $18,564 |
Average Income
Median Household Income
Poverty Rate