Isulan is centrally located and is accessible to all neighboring towns
not only within the Province of Sultan Kudarat Province but also in some
municipalities of the Province of Maguindanao, South Cotabato and even that of Davao del Sur. It is bounded on the North by the Municipality of Esperanza, Northeast by the Municipality of Lambayong; on the East by Tacurong Municipality; on the South by the municipalities of Bagumbayan and Sen. Ninoy Aquino; on the Southeast by the municipality of Norala, South Cotabato; and on the West by the Municipalities of Lebak and Kalamansig. It has a total land area of 54,125 hectares.
The present territories of Isulan formerly belonged to the municipalities of Koronadal and Dulawan. The municipality of Koronadal was created under E.O. No. 82 dated August 8, 1947 by Pres. Manuel L. Roxas.
0n March 10, 1953, the municipality of Norala, Cotabato was created by virtue of E.O.NO.572, whose territorial jurisdiction was taken from the municipality of Koronadal.
Datu Kudanding Camsa in the latter part of 1956 initiated the
creation of another municipality to be taken from the Municipality of Norala, Cotabato.
On March 20, 1957, Engr. Jose M. Ancheta of the Bureau of Public Highways of Cotabato made its first endorsement to the provincial board and laid down the proposed boundaries of the new municipality.
Acting on this report, the provincial board of Cotabato thru Resolution No. 316 series of 1957, petitioned the President of the Philippines to create the proposed municipality.
Executive Order No. 266, pursuant to section 68 of the Administrative
Code, issued and signed by the then President Carlos P. Garcia on
August 30, 1957, creating the municipality of Isulan, whose territorial
jurisdiction was taken from the municipality of Norala, Cotabato and Dulawan, Cotabato (Now Datu Piang, Maguindanao).
With the creation of the municipality of Isulan, Kalawag became the
seat of its government. The municipal government officially functioned
on September 12, 1957 with the appointment of its municipal mayor Datu
Suma Ampatuan who served until 1967.
