Middlesex

Middlesex is a mentioned only location.

Background
In the Museum of Freedom, an exhibit featuring the Revolutionary War includes the line, "Awake, men of Middlesex! The King's regulars are coming out!" when describing events before the battles of Lexington and Concord.

Appearances
Middlesex is mentioned in Fallout 4.

Behind the scenes
Middlesex County is the location of the real world battles of Lexington and Concord.