Sreenagar and sirajdikhan upazilas on the north, Zanjira upazila on the south, Tongibari upazila on the east, Shibchar upazila on the west.

Lohajang thana was established in 1916 and was turned into an upazila in 1983. It consists of 12 union parishads, 115 mouzas and 134 villages.

Lohajang Upazila is located in Munshiganj District. Upazilla(s)/Thana(s) in Munshiganj are Gazaria Upazila, Lohajang Upazila, Munshiganj Sadar Upazila, Serajdikhan Upazila, Sreenagar Upazila, Tongibari Upazila.