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)
 * New Canaan (Van Buren)
 * Denver (Van Buren)
 * Grand Canyon (Van Buren)
 * The Nursery (Van Buren)
 * Maxson Bunker (Van Buren)
 * Mesa Verde (Van Buren)
 * The Reservation (Van Buren)
 * Tibbets Prison (Van Buren)
 * Twin Mothers (Van Buren)
 * Vault 0 (Fallout Tactics)
 * Vault 29 (Van Buren)

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