Tinmouth was established in 1761 in a region that came to be known as the New Hampshire Grants. At the first U.S. census, the town had a population of 935. Tinmouth's population peaked in 1820, and for the next 150 years the town's population gradually declined, reaching its lowest (268) in 1970. The town reached a population of 567 at the 2000 census, the first time since the 1880 census that it was above 500.
Tinmouth was established in 1761 in a region that came to be known as the New Hampshire Grants. At the first U.S. census, the town had a population of 935 Tinmouth's population peaked in 1820, and for the next 150 years the town's population gradually declined, reaching its lowest (268) in 1970. The town reached a population of 567 at the 2000 census, the first time since the 1880 census that it was above 500.