Im starting this thread to hopefully help people having issues finding power armour. I know of 3 locations so I am hoping others can provide more.
The locations I am aware of:
NW Commonwealth
:
As part of When Freedom Calls quest in Concord
Military Armour Transport ENE of Tenpines Bluff
Military Armour Transport South of Drumlin's Diner
Due east of Sanctuary...SE of Disposal Robotics Ground is a crashed vertibird with an intact suit of power armour
North Central Commonwealth:
National Guard Training Yard: Between Relay Tower OMC-810 and Revere Satellite Array
Revere Satellite Array also has one
Crashed Vertibird: SE of Rotten Landfill by the lake
Military APCS: SSE West Everett Estates
Military Convoy: WSW of Finch Farm
Western Commonwealth:
South of Fort Hagen and the clinic is an Abandoned Power Armour Warehouse with a suit of power armour and some T-51 parts
Federal Ration Stockpile: West of ArcJet Systems (will show on map as a trailer with 2 windows)
Fiddler's Green Trailer Estates: E of Fort Hagen Filling Station
Mass Pike Interchange: On the highway SSE of Fort Hagen
Military Checkpoint: NW of Wattz Consumer Electronics
Crashed Vertibird: East of Graygarden on the freeway
Military Checkpoint: From the power armour warehouse mentioned above go SE and you will find it
Coastal Commonwealth:
Prydwen airship if doing BOS questline
Fort Strong:2 suits supposedly: Located SW of Specacle island
Glowing Sea:
Roadside Pines Motel: South of Poseidon Resevoir
Abandoned Shack: SW of Federal Supply Cache 84NE
Cave: Raider Power Armour: East of Crater of Atom
Southern Commonwealth:
South Boston Military Checkpoint: East of John's Salvage
Quincy Ruins: North of Quincy Police Station: Which also has one
Atom's Cats Garage: WNW of Warwick Homestead
Poseidon Energy: Raider Power Armour: Wast of Quincy Police Station
Military Barge (University Point): Northwest of Atom's Cats Garage
Crashed Vertibird: (Marshland): west of murkwater construction site
Boston Neighborhoods:
Cambridge:
Cambridge Polymer Labs: Use radioactive sample with gold and lithium to make this power armour chest piece
Charlestown:
None:
The Fens:
Wreck of USS Riptide: Raider Power Armour
Diamond City Merchant also sells a power armour frame for 5200 caps
Esplanade:
None
Back Bay:
None
Beacon Hill:
None
North End:
Crashed Vertibird (military barge) T:45 Power Armour
Boston Common:
Massachusetts State House: Raider Power Armour
Financial District:
Goodneighbor: Bobbi's Place:
35 Court: NE of Postal Square
Theater District:
Mass Bay Medical Center: T-45 Power Armour
Boston Harbor (Waterfront):
None
South Boston:
None
The vast majority of these Power Armour suits are leveled
Hope this helps in some way