Cabugao, officially the Municipality of Cabugao, is a 1st class municipality in the province of Ilocos Sur, Philippines. According to the 2020 cens…Cabugao, officially the Municipality of Cabugao, is a 1st class municipality in the province of Ilocos Sur, Philippines. According to the 2020 census, it has a population of 38,884 people. In the beginning, the place was only a wilderness, a thick forest where peaceful nomads roamed and hunted. For fish, which were also abundant, there was a river. On these occasional visits, the hunters noticed the fertile and flatlands that could be tilled, and they decided to stay. They were the first settlers.