Land for sale in Mountrail County, North Dakota, recently totaled around $4 million and almost 1,000 acres. Mountrail County ranks 17th in the Peace Garden State for the total acreage of land currently advertised for sale. Stanley had the most land for sale. Economically speaking, Mountrail County's is largely dependent on mining and mineral extraction-related businesses and services. Mountrail County is one of the ten largest counties in North Dakota (1,941 square miles). It's located in the Central North Dakota region of the state.