Fallout 4 has 20 Bobblehead, a collectible which give player a permanent bonus, perk and many other things. These 20 Bobblehead is located at different area in Fallout 4. The guide below provides detail on location of All 20 Bobblehead in Fallout 4 along with the bonus it unlocks.
Perception Bobblehead
Location: Museum of Freedom
Unlock: Your Perception has been permanently increased by 1
Speech Bobblehead
Location: Park Street Station – Vault 114
Unlock: All vendors permanently have 100 more caps for bartering
Energy Weapons Bobblehead
Location: Fort Hagen
Unlock: Permanently gain +25% critical damage with energy weapons
Science Bobblehead
Location: Malden Middle School – Vault 75
Unlock: Get one extra guess when hacking terminals
Charisma Bobblehead
Location: Parsons State Insane Asylum
Unlock: You must have The Secret of Cabot House quest to enter asylum. Player need to be at level 10 and complete Special Delivery and Emogene Takes a Lover quests first. To start the quest, player need to kill some guards outside asylum and then find and talk to Edward Deegan (he will be at one of these location: Dugout Inn in Diamond City, Third Rail in Goodneighbor, Market area in Bunker Hill or Colonial Taphouse). Then start Special Delivery quest and once that's over, you can do Emogene Takes a Lover.
Explosive Bobblehead
Location: Saugus Ironworks
Unlock: Permanently gain +15% damage with explosives
Intelligence Bobblehead
Location: Boston Public Library
Unlock: Your Intelligence has been permanently increased by 1
Melee Bobblehead
Location: Trinity Tower
Unlock: Permanently gain +25% critical damage with melee weapons
Strength Bobblehead
Location: Mass Fusion Building
Unlock: Your Strength has been permanently increased by 1
Medicine Bobblehead
Location: Vault 81
Unlock: Stimpaks permanently heal 10% more damage. You must talk to the doctor inside the vault and then leave and return to the vault later. At this point Bobby will mention a secret vault and open it for you.
Repair Bobblehead
Location: Corvega Assembly Plant
Unlock: Fusion cores permanently last 10% longer
Sneak Bobblehead
Location: Dunwich Borers
Unlock: You are permanently 10% harder to detect
Barter Bobblehead
Location: Longneck Lukowski’s Cannery
Unlock: Prices are permanently 5% better
Big Guns Bobblehead
Location: Vault 95
Unlock: Permanently gain +25% critical damage with heavy weapons
Small Guns Bobblehead
Location: Gunners Plaza
Unlock: Permanently gain +25% critical damage with ballistic guns
Unarmed Bobblehead
Location: Atom Cats Garage
Unlock: Permanently gain +25% critical damage with unarmed attacks
Endurance Bobblehead
Location: Poseidon Energy
Unlock: Your Endurance has been permanently increased by 1
Luck Bobblehead
Location: Spectacle Island
Unlock: Your luck has been permanently increased by 1
Agility Bobblehead
Location: Wreck of the FMS Northern Star
Unlock: Your Agility has been permanently increased by 1