Burhanuddin and Tazumuddin upazilas on the north, Charfasson upazila on the south, Manpura upazila on the east, Dashmina and Bauphal upazilas on the west.

Lalmohan thana was established in 1919 and was turned into an upazila in 1983. The upazila consists of 1 municipality, 9 union parishads, 54 mouzas, 76 villages.

Lalmohan Upazila is located in Bhola District. Upazilla(s)/Thana(s) in Bhola are Bhola Sadar Upazila, Burhanuddin Upazila, Charfasson Upazila, Daulatkhan Upazila, Lalmohan Upazila, Manpura Upazila, Tazumuddin Upazila.