In 'Under the Dome', what is the name of the town trapped under the dome?

In Stephen King’s Under the Dome, the town trapped beneath the dome is Chester’s Mill.

Chester’s Mill is a fictional small town in Maine. At 11:44 a.m. on October 21, an invisible, dome-shaped barrier abruptly surrounds the community and cuts it off from the outside world. The barrier is effectively impassable and causes immediate deaths and injuries, trapping residents, vehicles, and aircraft within its boundary.

The crisis quickly becomes both a survival story and a political drama. Dale “Barbie” Barbara works to help the town while James “Big Jim” Rennie exploits the emergency to consolidate power. Shortages, panic, violence, and the dome’s unknown origin expose the town’s existing social tensions.

Readers sometimes mix up Chester’s Mill with Derry, Castle Rock, or Jerusalem’s Lot, other fictional Maine settings associated with Stephen King. Those towns belong to different stories. Under the Dome was published in 2009 and follows Chester’s Mill across eight days. The novel ultimately reveals that the dome was created by extraterrestrial children using a device as part of a cruel experiment.