Groton is a town in Grafton County, New Hampshire, United States. The population was 569 at the 2020 census.
According to the United States Census Bureau, the town has a total area of 40.8 square miles (105.6 km2), of which approximately 40.7 square miles (105.4 km2) are land and 0.077 square miles (0.2 km2) are water, comprising 0.16% of the town.[1] The highest point in Groton is the summit of Tenney Mountain, at 2,350 feet (720 m) above sea level. The Cockermouth River, a tributary of Newfound Lake, flows from west to east across the center of the town. Groton lies fully within the Merrimack River watershed.
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