Shady Sands is the capital city of the New California Republic. With a population in the tens of thousands by 2241, it is possibly the largest known settlement in the post-War United States.
Vault City is a high-tech settlement in West Nevada, established by the inhabitants of Vault 8 after the Great War. The Vault opened in 2091 after receiving the all-clear signal. The city was built around the Vault, using its fusion generator as a power source and knowledge contained in the G.E.C.K to establish the first structures.