Nashua is a city in southern New Hampshire, United States. As of the 2010 census, Nashua had a population of 86,494, making it the second-largest city in the state and in northern New England after nearby Manchester. As of 2018 the population had risen to an estimated 89,246. Nashua is, along with Manchester, one of two seats of New Hampshire’s most populous county, Hillsborough County.
Nashua is in southeastern Hillsborough County at 42°45′04″N 71°28′51″W / 42.751038°N 71.480817°W / 42.751038; -71.480817 (42.751038, −71.480817). It is bordered to the south by Middlesex County, Massachusetts.
According to the United States Census Bureau, the city has a total area of 31.9 square miles (82.6 km), of which 30.8 square miles (79.9 km) is land and 1.0 square mile (2.7 km) is water, comprising 3.25% of the city. The eastern boundary of Nashua is formed by the Merrimack River, and the city is drained by the Nashua River and Salmon Brook, tributaries of the Merrimack. The Nashua River roughly bisects the city. Pennichuck Brook forms the city’s northern boundary. The highest point in Nashua is Gilboa Hill in the southern part of the city, at 426 feet (130 m) above sea level.
As of the census of 2010, there were 86,494 people, 35,044 households, and 21,876 families residing in the city. The population density was 2,719.9 people per square mile (1,050.2/km). There were 37,168 housing units at an average density of 1,202.8 per square mile (464.6/km). The racial makeup of the city was 83.4% White, 2.7% African American, 0.3% Native American, 6.5% Asian, 0.03% Pacific Islander, 4.6% from some other race, and 2.5% from two or more races. Hispanic or Latino of any race were 9.8% of the population.
There were 35,044 households out of which 28.7% had children under the age of 18 living with them, 45.9% were married couples living together, 11.6% had a female householder with no husband present, and 37.6% were non-families. 29.4% of all households were made up of individuals and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 3.01.
In the city the population was spread out with 22.1% under the age of 18, 9.3% from 18 to 24, 28.0% from 25 to 44, 27.8% from 45 to 64, and 12.7% who were 65 years of age or older. The median age was 38.5 years. For every 100 females, there were 97.3 males. For every 100 females age 18 and over, there were 95.8 males.
In 2011 the estimated median income for a household in the city was $60,923, and the median income for a family was $76,612. Male full-time workers had a median income of $60,365 versus $43,212 for females. The per capita income for the city was $30,937. About 4.6% of families and 9.3% of the population were below the poverty line, including 11.4% of those under age 18 and 5.9% of those age 65 or over.