Merrimack County, New Hampshire

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Merrimack County is a county in the U.S. state of New Hampshire. In 2000 the population was 136,225. The 2009 population was estimated to be 147,783.[1] Its county seat is Concord, the state capital. The center of population of New Hampshire is located in Merrimack County, in the town of Pembroke.[2]

Merrimack County was organized at Concord in 1823, and is named for the Merrimack River.[3] It was formed by removing towns from northern Hillsborough and Rockingham counties. In 1841 its original scope was somewhat reduced by the creation of Belknap County.[4]



According to the U.S. Census Bureau, the county has a total area of 956 square miles (2,476 km2), of which 934 sq mi (2,419 km2) is land and 22 sq mi (57 km2) (2.31%) is water.

Adjacent counties

National protected area


As of the census[5] of 2000, there were 136,225 people, 51,843 households, and 35,460 families residing in the county. The population density was 146 people per square mile (56/km²). There were 56,244 housing units at an average density of 60 per square mile (23/km²). The racial makeup of the county was 97.08% White, 0.54% Black or African American, 0.23% Native American, 0.86% Asian, 0.02% Pacific Islander, 0.23% from other races, and 1.04% from two or more races. 1.00% of the population were Hispanic or Latino of any race. 16.5% were of English, 13.4% Irish, 12.7% French, 11.0% French Canadian, 8.4% American, 6.4% German and 6.0% Italian ancestry according to Census 2000. 94.2% spoke English, 2.9% French and 1.1% Spanish as their first language.

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