San Narciso, officially the Municipality of San Narciso, is a municipality in the province of Zambales, Philippines. According to the 2020 census…San Narciso, officially the Municipality of San Narciso, is a municipality in the province of Zambales, Philippines. According to the 2020 census, it has a population of 30,759 people. The Municipality of San Narciso was founded in the early part of 18th century. The migrants from the Ilocandia arrived in the area and established their settlement in Alusiis which was the first name of the pueblo that later became San Narciso.