Sullivan County is a county located in the U.S. state of New Hampshire. In 2010, the population was 43,472. Its county seat is Newport.
Sullivan County was organized at Newport in 1827 and is named for John Sullivan, the Revolutionary War hero and a former governor. It was formed from the northern part of Cheshire County.
According to the U.S. Census Bureau, the county has a total area of 552 square miles, of which 537 sq mi is land and 15 square miles (2.63%) is water.
National protected area
Saint-Gaudens National Historic Site
At the 2000 census, there were 40,458 people, 16,530 households and 11,174 families residing in the county. The population density was 75/sq mi. There were 20,158 housing units at an average density of 38 per square mile. The racial makeup of the county was 97.99% White, 0.24% Black or African American, 0.29% Native American, 0.37% Asian, 0.02% Pacific Islander, 0.14% from other races, and 0.94% from two or more races. 0.55% of the population were Hispanic or Latino of any race. 16.9% were of English, 14.7% French, 11.7% French Canadian, 10.7% American, 10.0% Irish, 6.2% German and 5.1% Italian ancestry according to Census 2000. 96.1% spoke English and 1.6% French as their first language.
There were 16,530 households of which 29.40% had children under the age of 18 living with them, 54.70% were married couples living together, 8.60% had a female householder with no husband present, and 32.40% were non-families. 25.70% of all households were made up of individuals and 10.90% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.88.
23.90% of the population were under the age of 18, 6.40% from 18 to 24, 28.00% from 25 to 44, 25.90% from 45 to 64, and 15.80% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 97.10 males. For every 100 females age 18 and over, there were 93.50 males.
The median household income was $40,938 and the median family income was $48,516. Males had a median income of $32,185 versus $24,615 for females. The per capita income for the county was $21,319. About 5.20% of families and 8.50% of the population were below the poverty line, including 9.50% of those under age 18 and 8.80% of those age 65 or over.