- Martinsdale Colony is a Hutterite community and census-designated place (CDP) in Wheatland County, Montana, United States. As of the 2020 census, Martinsdale Colony had a population of 97. It is on the western edge of the county, bordered to the west by Meagher County and 4 miles (6 km) northeast of the unincorporated community of Martinsdale. The Musselshell River forms the southern edge of the CDP.