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is a town in Sullivan County, New Hampshire, United States. The population was 2,167 at the 2000 census, an increase of 920 from the 1990 census. This made Grantham the fastest growing town in Sullivan County between the 1990 and 2000 censuses.
Incorporated in 1761, Grantham takes its name from Thomas Robinson, 1st Baron Grantham, Secretary of State for the Southern Department from March 1754 to October 1755.
The families of Howe, Dunbar and Leavitt were all early Grantham settlers. All three families secured lands in Grantham as part of the charter granted to Baron Grantham in 1761, and all three families "have Grantham hills named after them," according to Elmer M. Hunt in
. "The Leavitts are said to have had at one time fifty children in attendance at the town's school, and over the years no fewer than seventeen teachers."