Tigbao, officially the Municipality of Tigbao, is a municipality in the province of Zamboanga del Sur, Philippines. According to the 2020 c…Tigbao, officially the Municipality of Tigbao, is a municipality in the province of Zamboanga del Sur, Philippines. According to the 2020 census, it has a population of 21,675 people. It was created by virtue of Republic Act No. 7162 on November 8, 1991. Tigbao was former part of Municipality of Dumalinao.