Chicago

Chicago was a city located in the pre-War state of Illinois.

Background
Before the Great War, detective Nick Valentine together with his fiance Jennifer Lands transferred from the Chicago Police to Boston to assist the Boston Police Department in Operation Winter's End.

Sometime after the defeat of the Master in 2162, the Brotherhood of Steel dispatched at least one airship east, to track down the remnants of the Unity super mutant threat. The airship crash landed near the ruins of Chicago. The survivors initially organized themselves into a new detachment, but by 2254 they had gone rogue, cutting all contact with the larger Brotherhood.

However, there are suggestions that the Enclave maintains outposts within the ruins. There is also a West Coast super mutant population, that the Brotherhood fought or assimilated. It is also where Tommy recovered ED-E, and after pleading with his father, brought it back to his mother's garage for repairs.

Appearances

 * The remains of Chicago appear only in the Fallout Tactics intro, and the campaign begins in a tribal village established among the ruins of Chicago, as the Eastern Brotherhood expands its influence.
 * Chicago is mentioned in conversations with Fallout 3 by Scribe Jameson or Scribe Rothchild about fighting super mutants or by asking about where the rest of the Brotherhood of Steel is.
 * The city is also mentioned in Fallout: New Vegas on a recording found on ED-E during the quest ED-E My Love, hinting at Enclave outposts located there.
 * It is furthermore mentioned in the Fallout: New Vegas add-on Lonesome Road, when the copy of ED-E is telling the Courier about Whitley and his journey to Navarro, to which the Courier will reply, "What's a Chicago?" and "Illin-what? You're making that name up." if they haven't met the Mojave ED-E.
 * In Fallout 4 it is mentioned on the holotape Welcome home!, as well as the source of the Skylanes 1981 flight in Skylanes smuggling manifest.
 * The city is mentioned in notes found at Aaronholt homestead in Fallout 76.
 * The city is also mentioned in the Fallout 76 add-on Wastelanders as where former astronaut and possible ally Sofia Daguerre lived as a child.

Behind the scenes
Chicago is, of course, Chicago, Illinois, in the Midwest United States.