Mount Holly is a town in Rutland County, Vermont, United States. It includes the hamlets of Belmont, Healdville, Hortonville, and Tarbellville. The population was 1,385 at the 2020 census. According to the United States Census Bureau, the town has a total area of 49.6 square miles, of which 49.2 square miles is land and 0.4 square miles, or 0.77%, is w…Mount Holly is a town in Rutland County, Vermont, United States. It includes the hamlets of Belmont, Healdville, Hortonville, and Tarbellville. The population was 1,385 at the 2020 census. According to the United States Census Bureau, the town has a total area of 49.6 square miles, of which 49.2 square miles is land and 0.4 square miles, or 0.77%, is water.