New England Commonwealth

The Massachusetts was one of the thirteen commonwealths of the pre-War United States. Created in 1969, it was comprised of the former states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island and Connecticut.

The Commonwealth
The Commonwealth is what is left of the pre-War American region. Massachusetts was also part of the New England Commonwealth of the United States in the alternate history of the Fallout universe. Most of it is a war-ravaged quagmire of violence and despair like much of the rest of the former United States, but it is also where the mysterious Institute is located.

Known locations
The Commonwealth
 * Glowing Sea (Fallout 4)
 * Boston (Fallout 4)
 * Bunker Hill (Fallout 4)
 * Concord (Fallout 4)
 * Museum of Freedom (Fallout 4)
 * Sanctuary Hills (Fallout 4)
 * Vault 111 (Fallout 4)
 * Diamond City (Fallout 4)
 * The Institute (Appears in Fallout 4, mentioned in Fallout 3 and ''Fallout: New Vegas)
 * Lexington (Fallout 4)
 * Paul Revere Monument (Fallout 4)
 * Quincy (Fallout 4)
 * Salem (Appears in Fallout 4, Mentioned in Mothership Zeta)
 * Scollay Square (Fallout 4)

Appearances
The Massachusetts Commonwealth appears only in Fallout 4, and is mentioned in Fallout 3 and its add-ons The Pitt, Broken Steel, Point Lookout, and Mothership Zeta, as well as Fallout: New Vegas.