Irisan is originated from the word ''Idisan". It is a wood used to grind to make it fine.During the early period of time, Irisan was known a thickly forested with pine trees and also called as Bayanihan.
However ,it is a part of Baguio then later became the largest
Barangay in Baguio City that possess the highest population in the City.
Gold panning was done and lime.Lime to supply for their gold mines in Itogon.
There are a certain families of Ibaloi who first lived in Irisan such as the family of Luna.Virginia Luna is a native from Barlig.The daughter of Catalino Pablo.She is married to Felix Luna after her separation to Lopez Oseo.She born 9 children,one adopt and one another step sister. She is just a High School graduate but she is good in communication.She is also a business woman.
Land before only cost two pesos per sqm.
Irisan has 33 purok. Settlers are from CAR,Manila,and lowland provinces. As the population increased ,the number of houses also increased but some don't have the legal permits and tittles.Then it comes the demolition.
A lot of Ibaloi families are commonly known before in Irisan/Baguio as the ones who first lived in the place.However,the place is near the lowland that's the reason why people in the area became mix.