Formerly a part of the town of Upi, Datu Blah T. Sinsuat became another municipality after a plebiscite on September 16, 2006 and pursuant to the Muslim Mindanao Act No. 198 of the ARMM. On October 28, it became a new municipality of the newly created Shariff Kabunsuan province until its nullification by the Supreme Court in July 2008. The orphaned municipality was absorbed by the province of Maguindanao.
Cotabato (Only geographically located within but administratively independent from the province. Grouped under the 1st District of Maguindanao but statistically grouped under (North) Cotabato province by the National Statistics Office)