In time, the town re-applied as a candidate for municipality. The Municipality of Bayog became the 29th municipality of the Province of Zamboanga del Sur on May 8, 1967, by virtue of Republic Act No. 4872, authorized by then Congressman Vincenso Sagun. The new municipality was formed out of twenty barrios of the Municipality of Buug (at that time still Province of Zamboanga del Sur): Bayog (which became the poblacion), Bobuan, Datagan, Pulangbato, Dipili, Salawagan, Lamari, Damit, Depasi, Pangi (now San Isidro), Liba, Datagan I, Datagan II, Mataga, Dimalinao, Baking, Dipuri, Kwai, Maton-og and Kanipa-an. During the later part of the year, barangays Supon, Canoayan, Dagum, Camp Blessing, Conakon, Matin-ao, Balukbahan, Sigacad, Deporehan, Bantal and Balunbunan were created by virtue of a Provincial Board Resolution. To date, the Municipality has twenty-eight (28) barangays within its juridical boundaries.