Londonderry 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 24,129 at the 2010 census. Londonderry is known for its apple orchards and is partial home to Manchester-Boston Regional Airport. 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.