Four States Commonwealth

The  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 Utah, Colorado, Arizona and New Mexico.

Known places

 * Bloomfield Space Center (Van Buren)
 * Boulder Dome (Van Buren)
 * Buena Vista (Fallout Tactics)
 * Flagstaff (Fallout: New Vegas Official Game Guide)
 * Denver (Fallout: New Vegas, Van Buren)
 * Grand Canyon (Fallout: New Vegas, Van Buren)
 * Maxson Bunker (Van Buren)
 * Mesa Verde (Van Buren)
 * The Nursery (Van Buren)
 * New Canaan (Fallout: New Vegas, Van Buren)
 * Ouroboros (Van Buren)
 * The Reservation (Van Buren)
 * Tibbets Prison (Van Buren)
 * Twin Mothers (Van Buren)
 * Two Sun (Fallout: New Vegas)
 * Vault 0 (Fallout Tactics)
 * Vault 29 (Van Buren)

Appearances
Parts of the former Four States Commonwealth appear in Fallout Tactics and Fallout: New Vegas. Most of the places in Van Buren and Fallout d20 were located there as well.