San Sebastián is a town and municipality of Puerto Rico located in the northwestern region of the island, south of Isabela, Quebradillas and Camuy; north of Las Marías; east of Moca and Añasco; and west of Lares. San Sebastián is spread over twenty-four barrios and San Sebastián Pueblo. It is a principal city of the Aguadilla-Isabela-San Sebastián Metropolitan Statistical Area.