Gaffargaon and Pakundia upazilas on the north, Kaliganj (Gazipur) and Palash upazilas on the south, Monohardi and Shibpur upazilas on the east, Sreepur upazila on the west.

Kapasia thana, now an upazila, was established in 1947. The upazila consists of 11 union parishads, 166 mouzas and 231 villages.

Kapasia Upazila is located in Gazipur District. Upazilla(s)/Thana(s) in Gazipur are Gazipur Sadar Upazila, Kaliakair Upazila, Kaliganj Upazila, Kapasia Upazila, Sreepur Upazila.

Tok Fort (built in the 6th century), Karnapur Fort (built by king Karna in 1045), Jora Dighi (joint tanks), Dargapara Shahi Jami Mosque (Tok), Ashram of Bangshi Babaji (at Safaisri) and Raniganj Fort (Mughal period).