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Charlestown is named after King Charles II, and was incorporated in 1738. The area was formerly part of the town of Westerly. It was in turn divided and the part north of the Pawcatuck River became the town of Richmond in 1747.
Geography\nAccording to the United States Census Bureau, the town has a total area of 153.6 km² (59.3 mi²). 95.4 km² (36.8 mi²) of it is land and 58.1 km² (22.5 mi²) of it is water. The total area is 37.86% water.
Demographics\nAs of the census of 2000, there are 7,859 people, 3,178 households, and 2,278 families residing in the town. The population density is 82.4/km² (213.3/mi²). There are 4,797 housing units at an average density of 50.3/km² (130.2/mi²). The racial makeup of the town is 96.26% White, 0.38% African American, 1.26% Native American, 0.61% Asian, 0.03% Pacific Islander, 0.53% from other races, and 0.93% from two or more races. 1.11% of the population are Hispanic or Latino of any race.
There are 3,178 households out of which 28.3% have children under the age of 18 living with them, 60.4% are married couples living together, 7.8% have a female householder with no husband present, and 28.3% are non-families. 21.8% of all households are made up of individuals and 8.1% have someone living alone who is 65 years of age or older. The average household size is 2.46 and the average family size is 2.88.
In the town the population is spread out with 21.8% under the age of 18, 6.3% from 18 to 24, 29.4% from 25 to 44, 28.0% from 45 to 64, and 14.5% who are 65 years of age or older. The median age is 41 years. For every 100 females there are 98.2 males. For every 100 females age 18 and over, there are 98.5 males.
The median income for a household in the town is $51,491, and the median income for a family is $56,866. Males have a median income of $40,616 versus $29,474 for females. The per capita income for the town is $25,642. 5.1% of the population and 3.0% of families are below the poverty line. Out of the total people living in poverty, 4.7% are under the age of 18 and 4.7% are 65 or older.