Narayanganj Sadar, Bandar (Narayanganj) and Sonargaon upazilas on the north, Bhedarganj upazila on the south, Gazaria and Matlab upazilas on the east, Tongibari and Naria upazilas on the west.

Munshiganj Sadar thana was turned into an upazila in 1984. It consists of 9 union parishads, 2 municipalities (Sadar and Mirkadim), 94 mouzas and 219 villages.

Munshiganj Sadar 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.

Idrakpur Fort (1660) at Munshiganj town, Panditer Bhita (birth place of Atish Dipankara) at Vajrayogini, Baba Adam's Mosque at Rampal, home stead of Raja Vallala Sena, Rampal Dighi, Raja Harish Chandra's Dighi, Kodal Dhoar Dighi, home stead of Raja Sreenath, marble statue of Ashutosh Ganguly at the library room of Haraganga College.