Question: where are all the vaults fallout 4?
Answer: Vault 81. Vault 81 is the only one that's still functional – as in, being used by actual vault dwellers. ... 
Vault 95. Vault 95 is located in the far south-west of the world map, almost on the edge of the Glowing Sea. ... 
Vault 75. Vault 75 is under Malden Middle School, north of the Bunker Hill monument.