Friendsville is a town in Garrett County, Maryland, United States. The population was 438 at the 2020 census. According to the United States Census Bureau, the town has a total area of 0.91 square miles, all land. The Youghiogheny River flows through the town and is renowned by the whitewater kayaking/rafting community as the take-out for the famou…Friendsville is a town in Garrett County, Maryland, United States. The population was 438 at the 2020 census. According to the United States Census Bureau, the town has a total area of 0.91 square miles, all land. The Youghiogheny River flows through the town and is renowned by the whitewater kayaking/rafting community as the take-out for the famous Upper Yough run.