Isulan, officially the Municipality of Isulan, is a municipality and capital of the province of Sultan Kudarat, Philippines. According to the 2020 ce…Isulan, officially the Municipality of Isulan, is a municipality and capital of the province of Sultan Kudarat, Philippines. According to the 2020 census, it has a population of 97,490 people. The Christian settlers would have preferred to decide the name of their new town by referendum. However, Datu Kudanding Camsa, both revered and feared, had decided it by himself.