Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2010 census, the population was 400,721. The population was estimated at 407,761 in 2016. Its county seats are Manchester and Nashua. Hillsborough is northern New England's most populous county as well as its most densely populated. Hillsborough County comprises the Manchester-Nashua, NH Metropolitan Statistical Area, which in turn constitutes a portion of the Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area.
Hillsborough was one of the five original counties identified for New Hampshire in 1769, and was named for Wills Hill, the Earl of 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 first to Milford in 1866 then 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 square miles (2,270 km²) is land and 16 square miles (41 km²) (1.8%) is water. The highest point in Hillsborough county is Pack Monadnock Mountain at 2,290 feet (700 m).
As of the 2010 United States Census, there were 400,721 people, 155,466 households, and 103,959 families residing in the county. The population density was 457.4 inhabitants per square mile (176.6/km²). There were 166,053 housing units at an average density of 189.5 per square mile (73.2/km²). The racial makeup of the county was 90.4% white, 3.2% Asian, 2.1% black or African American, 0.2% American Indian, 2.1% from other races, and 2.0% from two or more races. Those of Hispanic or Latino origin made up 5.3% of the population.
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