Wallingford is a town in Rutland County, Vermont, United States. The population was 2,129 at the 2020 census. Wallingford also contains the villages of East Wallingford and South Wallingford. According to the United States Census Bureau, the town has a total area of 43.5 square miles, of which 43.2 square miles is land and 0.2 square miles, or 0.48%, is w…Wallingford is a town in Rutland County, Vermont, United States. The population was 2,129 at the 2020 census. Wallingford also contains the villages of East Wallingford and South Wallingford. According to the United States Census Bureau, the town has a total area of 43.5 square miles, of which 43.2 square miles is land and 0.2 square miles, or 0.48%, is water.