Jolo (Tausug: Sug) is a first income class municipality on the island of Jolo, and the capital of the province of Sulu, Philippines. According to the 2010 census, it has a population of people, making it the most populous municipality in the province. Part of its population is of Chinese descent, mainly from Singapore. Of the population, 90 re Muslim, the remaining 10 re Christian. Jolo was the center of the government of the Sulu Sultanate.