Commonwealths

The thirteen commonwealths of the United States were created in 1969, as a new division of government. Both state and commonwealth names were used to describe regions and governmental entities before and after the Great War. In Massachusetts, the foundation of the Thirteen Commonwealths resulted in the discontinuation of the use of the local State House. In Appalachia, federal documents use the distinction "Territory of Appalachia."

Confirmed commonwealths
There are a total of thirteen commonwealths covering the United States of America. Only the following two have been mentioned in released games.

Great Midwest Commonwealth

 * John Cassidy mentions that there are miles-wide twisters in the Midwest and this region is one big radioactive dustbowl. He mentions that he regrets not exploring the area in his youth.
 * Although not explicitly noting a "commonwealth," ED-E's pre-War Illinois license plate reads "Great Midwest" across the top.
 * The Enclave maintained an outpost in Chicago. In the message Whitley recorded and stored before sending ED-E to Navarro, he requests anyone at the Chicago outpost to give the unit any repairs it needs.
 * When ED-E made it to Chicago, it was a young boy named Tommy, his father and mother that helped with the repairs.


 * Following the defeat of the Master, the Brotherhood of Steel suffered an internal conflict between reformists and traditionalists. Ultimately those that wished for reforms were sent east on an expedition to survey the extent of the remaining super mutant threat. A small fleet of airships was used in this task, with all but one being taken down by a storm as they crossed the Rocky Mountains. The surviving members of the expedition landed near Chicago. Far from the elders in Lost Hills, a new Midwestern Brotherhood chapter was formed. It diverged heavily from Brotherhood orthodoxy, incorporating many small towns, protecting the locals from raiders and other threats, and distributing advanced technology. They also began openly recruiting not just wastelanders, but ghouls, super mutants, and even talking deathclaws. By 2197, they had firmly established a neo-feudal society around Chicago.

Southwest Commonwealth

 * Although not explicitly noting a "commonwealth," the bumper sword's pre-War Nevada license plate reads "Southwest" across the top.
 * The commonwealth name is seen on the Red Rock Canyon stone marker and Nevada state flag.

Behind the scenes

 * The idea of dividing the United States into thirteen commonwealths originated during Fallout's development (1997). According to Tim Cain, Leonard Boyarsky didn't want to use the regular 50-star flag and used the 13-star design because "it looked cool", and planned to explain it as it being divided into 13 super-states, but the explanation never materialized.
 * The commonwealths were planned to be expanded on in Van Buren. The tech demo includes an U.S. soldier serving in a division of the Great Midwest Commonwealth (2003). Following its cancellation, Joshua Sawyer published a breakdown of the commonwealths and their constituent states in his unofficial RPG (2004), explaining that the commonwealths were an intermediate level of political organization created in the early 21st century to help create legislation broad enough to benefit those states with common regional concerns, but narrow enough not to affect those states with dissimilar interests or political cultures. The reality refused to conform, as the commonwealths did everything to promote their own interests at the expense of other commonwealths, not to mention the internal squabbles between states constituting the individual commonwealths. The breakdown was as follows:
 * Columbia Commonwealth, comprising the states of Maryland, the District of Columbia, and Virginia.
 * East Central Commonwealth, comprising the states of Ohio, Kentucky, and Tennessee.
 * Eastern Commonwealth, comprising the states of New York, Pennsylvania, New Jersey, Delaware, and West Virginia.
 * Four States Commonwealth, comprising the states of Utah, Colorado, Arizona, and New Mexico.
 * Great Midwest Commonwealth, comprising the states of Minnesota, Wisconsin, Michigan, Illinois, and Indiana.
 * Gulf Commonwealth, comprising the states of Louisiana, Mississippi, Alabama, and Florida.
 * New England Commonwealth, comprising the states of Maine, New Hampshire, Vermont, Massachusetts, Connecticut, and Rhode Island.
 * Northern Commonwealth, comprising the states of Montana, North Dakota, Wyoming, and South Dakota.
 * Northwest Commonwealth, comprising the states of Alaska, Washington, Oregon, and Idaho, and the northern half of California.
 * Plains Commonwealth, comprising the states of Iowa, Nebraska, Missouri, Kansas, and Oklahoma.
 * Southeast Commonwealth, comprising the states of North Carolina, South Carolina, and Georgia.
 * Southwest Commonwealth, comprising the states of Nevada and Hawaii, and the southern half of California.
 * Texas Commonwealth, comprising the states of Texas and Arkansas.
 * Although indirectly mentioned in every Fallout game due to the use of the 13-star flag, Commonwealths were first explicitly mentioned in Fallout: New Vegas (2010), with the Great Midwest Commonwealth and the Southwest Commonwealth being named in-game. In Fallout 4 (2015), the commonwealth foundation date was established as 1969, which differs from the "early twenty-first century" date of establishment from Joshua Sawyer's unofficial RPG.