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The entire town of Calolbon was originally under the jurisdiction of Saint Andrew the Apostle Parish. In the early 1950s, however, Saint Isidore Parish was established in the large neighborhood of Manambrag, and now includes all of the farming community of San Andres plus some barrios from outlying areas of the town. Saint Andrew the Apostle Church currently hosts has a number of Pious Associations, many of which are dedicated to the Blessed Virgin Mary.