The Columbia Commonwealth was one of the thirteen commonwealths of the pre-War United States of America. Created in the early 21st century, it was comprised of the former states of Maryland and Virginia, as well as the District of Columbia.
Capital Wasteland
The ruins of the capital, it comprises of DC, the Virginia's, a small part of the DC-Maryland border and a bit of Maryland itself. It is having power struggles between Brotherhood of the area, the Enclave survivors, and the super mutants. Vice and crime is rampant in the area, with raiders, mercenary bands, and creatures pillaging any and all things that move.
In the Fallout 3 add-on, Point Lookout, the bit of Maryland in the Capital Wasteland is explored. This bit is to be just past the DC-Maryland border and homes swampfolk abominations. The Swamplands there and wildlife is crazily mutated. Only a small group of tribals and wildlife reside there. Not much is known about the state, except that much of it wasn't hit by the bombs, and the damage done was the downfall of society, contact with the outside world, and the post-War radiation seeping into the state.
Known locations
Appearances
Parts of the Columbia Commonwealth, most notably around the Potomac river, appear in Fallout 3.
Behind the scenes
Bethesda Game Studios, the developer of Fallout 3, is headquartered in real-life Rockville, Maryland, although the name comes from Bethesda, Maryland, where the company was originally founded in 1985.