Agno, officially the Municipality of Agno, is a municipality in the province of Pangasinan, Philippines. According to the 2020 census, it has a popu…Agno, officially the Municipality of Agno, is a municipality in the province of Pangasinan, Philippines. According to the 2020 census, it has a population of 29,947 people. The name Agno was derived from a species of swamp tree called “Agno Casto”, a chaste tree used for medicinal concoctions to relieve pain and illness, that grew abundantly in the locality. In time, “Agno” was retained to become the name of the town.