Milton No. 292, Saskatchewan was first organised as a Local Improvement District named Wirral Improvement District in 1905. Rural Municipality of Milton No. 292 was established on December 11, 1911. It is a rural municipality in west-central Saskatchewan, Canada on the Alberta - Saskatchewan border. Milton No. 292, Saskatchewan operates from Box 70, Marengo, SK S0L 2K0. To the south the RM of Mantario No. 262 was disorganised on December 31, 1968. So now an expanded Chesterfield No.