Manchester is the largest city in the state of New Hampshire. The city is located in southern New Hampshire, along the Merrimack River. It's about 20 miles (32 kilometers) north of the state capital, Concord, and about 50 miles (80 kilometers) north of Boston, Massachusetts. Manchester is one of the largest cities in New Hampshire, with a diverse population. It had a population of 115,644 in 2020.