Sibutu, officially the Municipality of Sibutu, is a municipality in the province of Tawi-Tawi, Philippines. According to the 2020 census, it has a pop…Sibutu, officially the Municipality of Sibutu, is a municipality in the province of Tawi-Tawi, Philippines. According to the 2020 census, it has a population of 34,243 people. Due to an administrative error in the Treaty of Paris, while the remainder of the Philippines was ceded to the United States, Sibutu and Cagayán de Sulu were retained under Spanish Sovereignty until they were formally ceded to the United States upon the ratification of the Treaty of Washington on March 23, 1901.