Martinsdale is a census-designated place in southeastern Meagher County, Montana, United States. The town was a station stop on the now-abandoned transcontinental main line of the Chicago, Milwaukee, St. Paul and Pacific Railroad ("the Milwaukee Road"), and is a community center for nearby ranches and farms. Martinsdale was the home of the poet Grace Stone Coates, author of Black Cherries, Mead & Mangel-Wurzel, and Portulacas in the Wheat. It was also the home of Charles M.