Hillsborough County, New Hampshire

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Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of 2000, the population was 380,841. The 2009 population was estimated to be 403,288.[1] Its county seats are Manchester and Nashua. Hillsborough is northern New England's most populous county as well as its most densely populated.



Hillsborough was one of the five original counties identified for New Hampshire in 1769, and was named for Wills Hill, the Viscount Hillsborough who was British Secretary of State for the Colonies at the time. The county was organized at Amherst on March 19, 1771. In 1823 a number of towns were removed to become part of Merrimack County. Over several years ending in 1869, county administrative functions were moved from Amherst to the current seats of Manchester and Nashua.


According to the U.S. Census Bureau, the county has a total area of 892 square miles (2,310 km2), of which 876 sq mi (2,270 km2) is land and 16 sq mi (41 km2) (1.78%) is water. The highest point in Hillsborough county is Pack Monadnock Mountain at 2,290 feet (700 m).

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