Nashua is a city in southern New Hampshire, United States. As of the 2010 census, it had a population of 86,494, the second-largest in northern New England after nearby Manchester. As of 2019 the population had risen to an estimated 89,355. Along with Manchester, it is a seat of New Hampshire's most populous county, Hillsborough.
Built around the now-departed textile industry, in recent decades Nashua has been swept up in southern New Hampshire's economic expansion as part of the Boston region. It was twice named "Best Place to Live in America" in annual surveys by Money magazine. It is the only city to get the No. 1 ranking on two occasions—in 1987 and 1998.
The area was part of a 200-square-mile (520 km2) tract of land in Massachusetts called "Dunstable", which had been awarded to Edward Tyng of Dunstable, England. Nashua lies approximately in the center of the original 1673 grant.