This barrio was established in 1708 and its name was supposed to have been given from the “dayap or lime” which presumably grew in abundance in the area. Its original inhabitants were the Torralba, Semira, Mendoza, Rena, Saez, Dimaano, de Castro and Villanueva families. Like other barrios in Ibaan, Dayapan also served as an evacuation place during World War II.
Dayapan is situated at approximately 13.8078, 121.1529, in the island of Luzon. Elevation at these coordinates is estimated at 110.1 meters or 361.2 feet above mean sea level.