Stationed 295 km southeast from Saskatoon, the RM of Lake Johnston No. 102 has a population of 170 and a population density of 0.3/km². The RM is home to the town of Mossbank and the localities of Ardill, Bishopric, Dunkirk, Expanse, and Mitchellton. The attractions in the area include the Old Wives Lake Bird Sanctuary and the Isle of Bays Wildlife Refuge.