Downtown is a Metro Federation settlement occupied by friendly survivors, Federation soldiers, and traders. This is one of the only settlements in the Commonwealth that welcomes outsiders with open arms, as the guards and citizens of Downtown are non-hostile to the player. Downtown is an excellent place to trade and barter goods, as there are vendors who sell food and weapons.

Downtown is difficult to gain entrance to, as its many entrances are protected by master level locked doors. The keys to these doors may be found on some dead Metro Federation soldiers, such as those found in the Boston Public Library, which can be accessed via Copley Station.