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For a list of all Commonwealths in the Fallout universe, see Commonwealths.
Fo Southwest Commonwealth
Fo Southwest Commonwealth
The Southwest Commonwealth
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The Southwest Commonwealth was one of the thirteen commonwealths of the pre-War United States. Created in 1969[1], it was comprised of the former states of Southern California, Nevada and Hawaii.

New CaliforniaEdit

Main article: New California

New California is a region defined by the New California Republic that is comprised of all of California as well as areas of northern Nevada, Southern Oregon and Baja California, Mexico.

Former Southern CaliforniaEdit

Also known as the Core Region, what was once southern California is a stark image of the effects of atomic warfare.

The city of San Diego was hit during the war, with its inhabitants eventually leading an exodus to the ruins of Los Angeles, also known as the Boneyard. The Boneyard is a vast stretch of ruined buildings, baking under the sun. In between is the Glow, the ruins of West Tek Research Base. The Hub, Junktown and Shady Sands are further up north.

Former NevadaEdit

The former state of Nevada is described as an empty no man's land in 2161, at least when compared to the Southern California Wasteland.[2] Few are able to traverse the rough terrain of the Sierra Nevada Mountains alone.

The region is, indeed, sparsely populated. New Reno is the most significant town of northern Nevada, with smaller settlements such as Vault City, Gecko and Broken Hills dotting the map.

Mojave WastelandEdit

Main article: Mojave Wasteland

The Mojave Wasteland is a wasteland comprised of southern Nevada and parts of California and Arizona. The Mojave Wasteland is having power struggles between the NCR invaders, Caesar's Legion tribals and Mr. House. Hoover Dam and the New Vegas Strip are the main interests and concerns. Drug running, gang life and rampaging tribals are not rare in the area, as well as runaway creatures and hostile wildlife.

Known locationsEdit

  • Former Hawaii (mentioned in Far Harbor)
    • Honolulu (mentioned in Fallout Tactics)
    • Pearl Harbor (mentioned in Fallout Tactics)


The Southwest Commonwealth appears in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas (and is mentioned in all of its add-ons) and the Fallout Bible. It was to appear in Van Buren and Jason Mical's Fallout Pen and Paper d20. The Mojave Desert is also mentioned in Fallout 4,[6] and the pre-War iteration of the Fabulous New Vegas sign appears in the Atomic Command Pip-Boy game.



  1. Plaque on the Massachusetts state house in Fallout 4 gives 1969 as the formation date of the "Thirteen commonwealths"
  2. Fallout endings:
    See super mutants / See Ending 1
  3. Dialogue with Joshua Graham indicates a California location: "Something bad happened near Death Valley, at a place called the Divide. NCR couldn't cut across anymore and it slowed down their reinforcements. Terrible storms ripped entire companies apart before they even got to Nevada soil."
  4. Nahant Oceanological Society terminal entries
  5. Fcryan.msg, Lines 118-119
  6. Jack Cabot dialogue: "Maybe I'll finally travel to the Southwest. My father was always convinced that there was another alien city buried somewhere in the Mojave Desert."
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