While the novel never explicitly states the exact location of Chamberlain, it's heavily implied to be a small, rural town in Maine. This is supported by:
* King's own background: Stephen King is from Maine and often uses the state as a setting in his works.
* Setting details: The story describes a rural town with a high school, a local grocery store, a nearby lake, and a general sense of isolation. These details are consistent with the image of a small town in Maine.
* Later adaptations: The film adaptations of *Carrie*, while taking some creative liberties, also generally uphold the setting as being in a small, rural town in Maine.
So, while *Carrie* doesn't name the town, it's widely understood to be in Chamberlain, Maine.