Los Angeles Vault. Location: Los Angeles, California. Appears in: Fallout. Purpose: Vault-Tec demonstration vault. Home to The Master, a monstrous hybrid of man and computer.

Vault 0. Location: Cheyenne Mountain, Colorado. Appears in: Fallout Tactics. Purpose: Monitor and control other vaults, maintain geniuses of pre-war United States in cryogenic stasis, improve conditions of the future wasteland with a robot army.

Vault 3. Location: West of Las Vegas, Nevada. Appears in: Fallout: New Vegas. Purpose: Control vault designed to open after twenty years, but was kept closed longer due to the inhabitants' wishes. Unplanned water leak forced them to open and attempt trade with the outside world. All inhabitants killed by a group of raiders shortly after the door was opened.

Vault 8. Location: Northern Nevada. Appears in: Fallout 2. Purpose: Control vault designed to open after ten years. Equipped with a Garden of Eden Creation Kit, in order to re-colonize the wasteland. Vault City is the result.

Vault 11. Location: Southwest of Las Vegas, Nevada. Appears in: Fallout: New Vegas. Purpose: Social experiment about human nature - specifically, the ability to sacrifice oneself to others and placing ideals above one's own life.

Vault 12. Location: Bakersfield, California. Appears in: Fallout. Purpose: Vault door designed to not close completely in order to expose inhabitants to radiation. Now known as Necropolis, with a large population of Ghouls.

Vault 13. Location: Mt. Whitney, California. Appears in: Fallout, Fallout 2. Purpose: Intended to open after two-hundred years, as a study in prolonged isolation. A broken water chip forced the Overseer to send a vault dweller into the wasteland to find a replacement. Records led The Enclave to their plan to end the war.

Vault 15. Location: Southern California. Appears in: Fallout, Fallout 2. Purpose: Intended to stay closed for fifty years, and include people of radically different ideologies. Descendants of inhabitants found three Raider groups, and the New California Republic.

Vault 17. Location: Unknown. Appears in: Fallout: New Vegas (mentioned only). Purpose: Unknown. Raided in 2154 and its inhabitants taken prisoner by the Master's Army. They were subsequently turned into super mutants.

Vault 19. Location: Red Rock Canyon, Nevada. Appears in: Fallout: New Vegas. Purpose: Population divided into two groups and kept in isolated sections of the vault. Inhabitants may have been chosen due to pre-existing paranoia.

Vault 21. Location: Las Vegas, Nevada. Appears in: Fallout: New Vegas. Purpose: Gambling. All inhabitants were gamblers, and all disputes settled through gambling. One of few non-control vaults to not fail.

Vault 22. Location: West of Las Vegas, Nevada. Appears in: Fallout: New Vegas. Purpose: Designed to develop advanced agricultural technologies. An experiment on pest control involving a genetically-manufactured spore annihilated or transformed the vault's inhabitants.

Vault 34. Location: East of Las Vegas, Nevada. Appears in: Fallout Bible, Fallout: New Vegas. Purpose: Armory overstocked with weapons and ammunition, with the door unlocked. Descendants of inhabitants form a group called Boomers.

Vault 87. Location: Capital Wasteland. Appears in: Fallout 3. Purpose: Research and test the effects of the Forced Evolutionary Virus.

Vault 92. Location: Near Old Olney, Capital Wasteland. Appears in: Fallout 3. Purpose: Populated by musicians and was a testbed for a white noise-based system to implant combat-oriented posthypnotic suggestions.

Vault 101. Location: Capital Wasteland. Appears in: Fallout 3. Purpose: Evaluation of an omnipotent, dictatorial Overseer. Never intended to open.

Vault 106. Location: Capital Wasteland. Appears in: Fallout 3. Purpose: Psychoactive drugs released into air filtration system ten days after door shut.

Vault 108. Location: Capital Wasteland. Appears in: Fallout 3. Purpose: Houses a cloning lab. All inhabitants are clones of a man named Gary.

Vault 111. Location: Boston, Massachusetts. Appears in: Fallout 4. Purpose: Currently unknown (you can find out for yourself as of today).

Vault 112. Location: Capital Wasteland. Appears in: Fallout 3. Purpose: Houses a virtual reality simulation called Tranquility Lane.

Secret Vault. Location: Los Ybanez, Texas. Appears in: Fallout: Brotherhood of Steel. Purpose: Protect important members of Vault-Tec, research the latest technologies and the Forced Evolutionary Virus.

Unfinished Vault. Location: Northern California. Appears in: Fallout 2. Purpose: Possibly the original site of Vault 13, before it was relocated.

Vault Prototype. Location: Texas. Appears in: Fallout: Brotherhood of Steel. Purpose: A small Vault-Tec facility, later used as a base of operations by the Brotherhood of Steel.