Hadji Mohammad Ajul is one of eleven (11) municipalities (along with one city) that comprise the province of Basilan in the Bangsamoro Autonomous Region. The town is politically subdivided into eleven (11) barangays, and is a part of the Lone Congressional District of Basilan.
The eleven (11) barangays that make up Hadji Mohammad Ajul were formerly part of the municipality of Tuburan.