Derry is a town in Rockingham County, New Hampshire, United States. The population was 33,109 at the 2010 census. Although it is a town and not a city, Derry is the fourth most-populous community in the state. The town's nickname, "Spacetown", derives from the fact that Derry is the birthplace of Alan Shepard, the first astronaut from the United States in space. Derry was also for a time the home of the poet Robert Frost and his family.