Derry is a fictional town and a part of Stephen King's fictional Maine topography. Derry has served as the setting for a number of his novels, novellas, and short stories. Derry first appeared in King's 1981 short story "The Bird and the Album", and has reappeared as late as his 2011 novel 11/22/63 (see list below). Derry is said to be near Bangor, but King has acknowledged that Derry is actually his portrayal of Bangor. A map on King's official website, though, places Derry in the vicinity of the town of Etna.
King, a native of Portland, created a trinity of fictional Maine towns — Derry, Castle Rock and Jerusalem's Lot — as central settings in more than one work.
On several occasions in It, the Losers find themselves at 29 Neibolt Street, a run-down, abandoned house near the trainyard. It is in this house – or rather, under the house's front porch – that Eddie Kaspbrak first encounters It, which shows itself as a mix between a homeless leper and its familiar Pennywise form. Later, after Eddie tells them his story, Bill and Richie go to investigate the house and are chased off by It, the creature having taken the form of a werewolf.
Soon after these incidents, the Losers Club goes back to the house in hopes of confronting It. However, soon after they confront It, the creature disappears into the sewers through a toilet pipe. They therefore decide to enter the sewers for their first showdown with It.
During It's 1985 killing spree, the body of one of the creature's victims is found directly across the street from the house.
The Barrens is a small tract of land still heavily covered in trees and plant life. Derry's landfill is located here, as is a gravel pit and several sewer pump-stations. The Barrens plays the most prominent a role in It, as the Losers adopt it as their home away from home, even building an underground there. Most of the Losers have their first meeting here while trying to build a small dam in the Kenduskeag Stream, which runs through the Barrens, and next, Derry.