Quezon, officially the Municipality of Quezon, is a municipality in the province of Isabela, Philippines. According to the 2020 census, it ha…Quezon, officially the Municipality of Quezon, is a municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 27,037 people. The town was named in honor of President Manuel L. Quezon, under the Republic Act No. 2418 which was approved on June 21, 1959.