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is a town in western Rockingham County, New Hampshire, United States. The town is bordered on the north by the city of Manchester and on the east by the town of Derry. The population was 23,236 at the 2000 census. Londonderry is known for its apple orchards and is partial home to the Manchester-Boston Regional Airport.
The more densely settled portion of town, where over 49% of the population resides, is defined as the Londonderry census-designated place (CDP) and roughly occupies the eastern and southern parts of town, around New Hampshire Route 102.
Londonderry lies in an area that was first known as "Nutfield" because of the heavy woods with nut trees. The town was settled in 1718. In 1722, it was chartered and given the name "Londonderry", after the city in the Province of Ulster in the northern part of Ireland called Londonderry or Derry.
Early Ulster Scots settlers spread out into surrounding villages, bringing Scottish and Irish names like Antrim, Derry and Dunbarton. Londonderry was the second largest town in early colonial times, and Derry, Windham and a portion of Manchester were formed from it.
In 1790, the first year that a census was taken in Londonderry, the population was 2,622.