Gazaria thana was established in 1954 and was turned into an upazila in 1983.
It consists of 8 union parishads, 114 mouzas and 120 villages.
Gazaria 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.