Bulusan is a fourth class municipality in Sorsogon Province, Philippines. According to the 2010 census, it has a population of 22,089 people.It is bordered by the towns of Barcelona in the north and going counterclockwise, the towns of Casiguran, Juban, Irosin and Santa Magdalena. The islets of San Bernardino, about 15 kilometres (9.3 mi) off the coast, falls under the jurisdiction of Bulusan.