Where are all the bobble heads?
Solution 1:
I checked 3 different sites and they all had these listed. Bobble-head Locations
Agility -- Wreckage of the FMS Northern Star Located on a wooden platform justpast the deck huts near the very edge of the ship's bow.
Barter -- Longneck Lukowski’s Cannery In an upper area of the main cannery room, look in the metal catwalk hut.
Big Guns -- Vault 95 On top of a radio in the northernmost room of the living quarters.
Charisma -- Parsons State Insane Asylum On Jack Cabot's desk inside his office in the Administration area.
Endurance -- Poseidon Energy Within the central metal catwalk hut, find the Bobblehead on the metal desk near a magazine.
Energy Weapons -- Fort Hagen Found on a small table between two fridges in the southwest kitchens of the Command Center.
Explosives -- Saugus Ironworks On the catwalk in the Blast Furnace area, near a magazine and steamer trunk.
Intelligence -- Boston Public Library Found in the northwest corner of the library, in the mechanical room near the computers.
Lock Picking -- Pickman Gallery In the final tunnel chamber where you meet Pickman, find the Bobblehead on the ground between the brick pillars.
Luck -- Spectacle Island Inside a locker next to the steamer trunk, on the green boat to the south of the island.
Medicine -- Vault 81 Found in Curie's office, in the southeast corner of secret Vault 81.
Melee -- Trinity Tower Head to the very top of Trinity Tower to find the Bobblehead within the cage where Rex and Strong are held.
Perception -- Museum of Freedom Found upon a metal desk inside the room where you meet Preston Garvey and the others.
Repair -- Corvega Assemply Plant On the southwest roof section of the plant, locate this Bobblehead at the very end of the overhead exterior structure.
Science -- Malden Middle School (Vault 75) Within the vault building, head to Basement level 3 and locate the collectibel on a desk overlooking the Diner area.
Small Guns -- Gunners Plaza Found upon the broadcast desk within the on-air room on the ground floor of the building.
Sneak -- Dunwich Borers Locate this Bobblehead on top of a small metal table next to a lantern beside the metal post terminal.
Speech -- Park Street Station (Vault 114) Found inside the Overseer's office where Nick Valentine is being held.
Strength -- Mass Fusion Building Find this Bobblehead on top of the high metal wall statue above the lobby desk.
Unarmed -- Atom Cats Garage Located on top the hood of the rusty car within the main warehouse
The ones that don't increase special give you a bonus to stats example Energy Weapons Bobble head gives 25% more crit damage with Energy weapons
Solution 2:
I've been working on this map for a few days now - all 20 Bobbleheads are marked on it. The above link will directly show only the Bobblehead markers.
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http://www.fallout4map.com/?category=4
Like @Nightmare mentioned, they don't all increase SPECIAL, some of them give bonuses to stats.