Aguadilla-Isabela-San Sebastian's 2026 population is now estimated at 296,307. In 1950, the population of Aguadilla-Isabela-San Sebastian was 156,487. Aguadilla-Isabela-San Sebastian experienced a decrease of -605 residents over the past year, marking an annual decline of -0.2%. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Aguadilla-Isabela-San Sebastian, which typically includes Aguadilla-Isabela-San Sebastian's population in addition to adjacent suburban areas.
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| San Juan | 2,430,740 | -0.12% |