Santhia upazila on the north, Rajbari Sadar and Pangsha upazilas on the south, Bera upazila on the east, Pangsha and Pabna Sadar upazilas on the west.

Sujanagar thana, now an upazila, was established in 1872. It consists of 10 union parishads, 191 mouzas and 195 villages.

Sujanagar Upazila is located in Pabna District. Upazilla(s)/Thana(s) in Pabna are Atgharia Upazila, Bera Upazila, Bhangura Upazila, Chatmohar Upazila, Faridpur Upazila, Ishwardi Upazila, Pabna Sadar Upazila, Santhia Upazila, Sujanagar Upazila.