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Castle Rock, Maine is part of Stephen King’s fictional Maine topography, and as such serves as the setting for a number of his novels, novellas, and short stories. Built similarly to the prototypical King town Jerusalem's Lot (featured in the novel Salem's Lot) and the town of Derry (featured in the novel It), Castle Rock is a typical small New England town with several dark secrets. It first appeared in the novel The Dead Zone. King eventually decided to stop using it as the setting of his works, and originally ended its use with the novel Needful Things. However, it has now been mentioned in later works, such as Riding the Bullet and as part of the setting of Bag Of Bones. The town may be based on King's home town of Durham, Maine and Lisbon Falls, Maine, where he attended high school. Population of Castle Rock was 1280 by 1959 and around 1500 as of its final chronological appearance in Needful Things. In "Creepshow" (1982), There is a sign at the end of "The Lonesome Death of Jordy Verrill" that puts Portland at 37 Miles, and Boston at 188 miles. Geographically this puts Castle Rock in the northern hemisphere of a 37 mile radius from Portland Me. This could include places such as Durham, Danville, Auburn, Lewiston, and maybe even Sabattus.
-- Wiki'ed, of course.