Boneyard

The Boneyard is what remains of Los Angeles. The headquarters of Vault-Tec was located somewhere in the LA area, and a VT demonstration Vault, which was not part of the Vault Experiment, was built there.

LA was pretty much decimated during the Great War. Most people in LA died after the bombs dropped, due to radiation poisoning, disease, famine and each other. Most of the people in the demonstration Vault left and of those that remained, most became the Master's servants and members of the Children of the Cathedral. Those that left could be part of almost any organization in LA. The majority of people in LA would have to be people who came to the city after the destruction. Most to scavenge what they could, be it equipment, food or people.

The Boneyard is the home to the Regulators, the Blades, the Followers of the Apocalypse, the Rippers and the Gun Runners, as well as a Deathclaw Nest. The Cathedral was built on top of the Vault, which was located somewhere outside the city.

By 2241, Los Angeles became one of the states of the New California Republic.

Appearances in games
Los Angeles appears in Fallout and Fallout: Brotherhood of Steel. In FOBOS, however, instead of the Boneyard it appears as the ghoul town of Los, which is entirely inconsistant with the previous games. Furthermore, the LA Vault in FOBOS is not a demonstration Vault, but a secret Vault designed for FEV research.