Located 372 km southeast from Saskatoon, the RM of Wolseley No. 155 has a population of 375 and has a population density of 0.5/km². The RM features the town of Wolseley and the localities of Adair, Ellisboro, Falcon, Grainer, and Summerberry. Wolf Creek flows through the RM and is home to the narrowleaf water plantain, the tall larkspur, and the common butterwort.