Grantham is a town in Sullivan County, New Hampshire, United States. The population was 2,985 at the 2010 census, up from 2,167 at the 2000 census, the greatest increase in population in Sullivan County over this time period. 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. Prior to county division in 1827, Grantham was in Cheshire County. 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 New Hampshire Town Names And Whence They Came.
“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.”As of the census of 2000, there were 2,167 people, 924 households, and 707 families residing in the town. The population density was 80.9 people per square mile (31.2/km2). There were 1,513 housing units at an average density of 56.5 per square mile (21.8/km2). The racial makeup of the town was 98.29% White, 0.28% African American, 0.09% Native American, 0.42% Asian, 0.09% from other races, and 0.83% from two or more races. Hispanic or Latino of any race were 0.55% of the population.
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