Groton is a town in Caledonia County, Vermont, United States. The population was 876 at the 2000 census. It contains the places Groton Pond, Rickers Mills, Rickers and West Groton.
According to the United States Census Bureau, the town has a total area of 55.0 square miles (142.3 km2), of which, 54.0 square miles (139.8 km2) of it is land and 1.0 square miles (2.6 km2) of it (1.82%) is water. The Waits River has its headwaters in Groton.
As of the census of 2000, there were 876 people, 338 households, and 252 families residing in the town. The population density was 16.2 people per square mile (6.3/km2). There were 586 housing units at an average density of 10.9 per square mile (4.2/km2). The racial makeup of the town was 96.46% White, 1.26% Native American, 0.23% from other races, and 2.05% from two or more races. Hispanic or Latino of any race were 0.34% of the population.