Nashua, New Hampshire in the context of "Concord, New Hampshire"

Manchester is the most populous city in the U.S. state of New Hampshire. Located on the banks of the Merrimack River, it had a population of 115,644 at the 2020 census. Manchester is the tenth-most populous city in New England. Along with the city of Nashua, it is one of two seats of New Hampshire's most populous county, Hillsborough County. The Manchester–Nashua metropolitan area has approximately 423,000 residents and lies near the northern end of the Northeast megalopolis.

Manchester was first named by the merchant and inventor Samuel Blodget(t), eponym of Samuel Blodget Park and Blodget Street in the city's North End. His vision was to create a great industrial center similar to that of the original Manchester in England, which was the world's first industrialized city. During the Industrial Revolution, Manchester was a major industrial and economic hub for New England, with the Amoskeag Manufacturing Company being the largest cotton textile plant in the world. After World War II, many textile manufacturing jobs left Manchester, but new industries and companies were introduced to the city, such as DEKA.

The Merrimack Valley is a bi-state region along the Merrimack River in the U.S. states of New Hampshire and Massachusetts. The Merrimack is one of the larger waterways in New England and has helped to define the livelihood and culture of those living along it for millennia.

Major cities in the Merrimack Valley include Concord, Manchester, and Nashua in New Hampshire, and Lowell, Lawrence, and Haverhill in Massachusetts. The Valley was a major center of the textile industry in the 19th century.

Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2020 census, the population was 422,937, almost one-third the population of the entire state. Its county seats are Manchester and Nashua, the state's two biggest cities. 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.