 The town was again chartered by act of the new Vermont Legislature on April 20, 1780.In this charter, the township was named Londonderry after Londonderry in New Hampshire, which in turn was named after Londonderry in Ireland.According to the United States Census Bureau, the town has a total area of 35.9 square miles (92.9 km2), of which 35.7 square miles (92.4 km2) is land and 0.2 square mile (0.5 km2) (0.59%) is water.