Galaxy class decks
The decks of a  Federation starship.

 Deck 1
 Bridge ( et al.)
 Captain's ready room ( et al.)
 Observation lounge ( et al.)
 Emergency turbolift ()
 Sections 9K to 12T ()
 Turbolift 2 ()
 Turbolift 3 ()
 Turbolift 4 ()

 Deck 2
 Sickbay, 2364 ()

 Deck 3
 Executive Dining room ()
 Room 3627: Guest Quarters ()

 Deck 4
 Main shuttlebay ()
 Cargo bays ()
 Cargo Bay 1 ()
 Cargo Bay 3 ()
 Cargo Bay 4 ()
 Cargo Bay 6 ()
 Room 2740: Cargo Hold 7 ()
 Cargo bay transporters ()
 Ship's stores ()
 Room 3012: Holodeck ()
 Section 8: Ro Larens quarters ()

Deck 5
 Interrogation/Detention Area ()

 Deck 6
 Transporter Room 2 ()
 Room 1053 ()
 Section 8-J
 Room 1654: Transporter Room 1 ()
 Room 1853: ()
 Room 2054: Transporter Room 3 ()
 Turbolift 11 ()
 Section 23 ()
 Section 25 ()
 Section 29 ()

 Deck 7
 Cabin 0735: Captain Edward Jellicos quarters, 2369 ()
 Section 4: Guest quarters ()
 Guest quarters ()
 Crew quarters ()
 Section 23 ()
 Section 25-Baker: Worfs quarters ()

 Deck 8
 Unfinished multipurpose deck ()
 Room 0142: VIP quarters ()
 Room 0522: Lieutenant Jenna D'Sora quarters ()
 Room 0910: Counselor Troi quarters ()
 Room 0912: Commander Riker quarters ()
 Room 1402: Guest accommodations () 
 Room 3402: Counselor's office ()
 Room 3601: Captain's quarters ()
 Battle bridge ()
 Emergency turbolift ()
 Crew quarters ()
 Guest quarters ()

 Deck 9
 Section 4: Guest quarters ()
 Section 17: Crew quarters ()
 Section 19: Crew quarters ()
 Section 28: Dr. Crusher's quaters ()
 VIP quarters ()
 Room 0910: Guest quarters, 2365 ()
 Room 0910: Deanna Troi's quarters, 2366/2367/2369 ()
 Room 0929: Maddy Calloway's quarters ()
 Room 0937: Guest quarters, 2366/2369 ()
 Officer's Quarters ()
 Room 3601: Jean-Luc Picard's quarters ()
 Security station ()
 Crew Quarters 
 Room 1947: Ensign Edward Hagler ()

 Deck 10
 Section 1: Ten Forward ()
 Section 2 ()
 Section 5 ()
 Crew quarters ()
 Holodeck 5 ()
 Room 5013 Planetary sciences laboratory ()
 Science laboratory ()

 Deck 11
 Room 0925: Holodeck 3 ()
 Room 1825: Holodeck 2 ()
 Room 2917: Holodeck 4J (, )

 Room 2917: Cargo Bay 11 ()
 Room 2926: Turbolift ()
 Turbolift 7 ()

 Deck 12
 Room 1627 ()
 Section 23 Baker, Room 1629: Chief medical officer's office ()
 Section 23 Baker, Room 1631: Sickbay ()
 Geordi La Forge's quarters, 2364 ()
 Biomedical Lab ()
 Nursery ()
 Gymnasium ()
 Room 2054 ()
 Science laboratory ()
 Transporter Room 8 ()

 Deck 13
 Jefferies tube
 1365-Baker ()
 Room 5973: Shuttlebay 2 ()
 Shuttlebay 3 ()

 Deck 14
 Transporter room ()
 Primary care classroom ()
 Turbolift 2 ()
 Conference Room ()

 Deck 15
 Jefferies tube
 J-4 ()
Science section
()

 Deck 16
 Guest quarters ()

 Deck 17
 Section 3 Alpha ()
 Section 21 Alpha: Arboretum ()
 Auxiliary turbolift to battle bridge ()
 Crew quarters ()

 Deck 18
 Cargo bay 4 ()

 Deck 20
 Jefferies tube
 Unknown ()

 Deck 21
 Room 5001 ()
 Transporter room ()

 Deck 22
 Lounge ()
 Turbolift 3 ()

 Decks 23 to 24
 Impulse System (Main), Fusion Reaction Systems (, display graphic)

 Deck 25
 Room 0293: Starboard nacelle Jefferies tube access ()
 Room 0294: Starboard nacelle tube/plasma injector ()
 Torpedo bay ()
 Room 5301: Docking port 5/airlock ()

 Decks 27 to 29
 Deuterium Confinement Tankage (, display graphic)

 Decks 30 to 35
 Deuterium injection subsystem (, display graphic)

 Deck 30
 Jefferies tube
 J-9 ()
 K-12 ()

 Deck 32
 Living quarters ()

 Deck 33
 Room 5244: Brig ()

 Deck 34
 Turbolift 5 ()

 Deck 35
 Aft Photon Torpedo Launcher (based on MSD)

 Deck 36
 Section 4: Main engineering, dilithium crystal chamber, dilithium chamber hatch, power transfer conduits ()
 Section 52 ()
 Droid Maintenance
 Science lab ()
 Room 5244: Jefferies tube access point ()
 Weapons room ()
 Turbolift 4 ()
 Turbolift 5 ()
 Turbolift 9 ()
 Corridor crossing with an MSD ()
 Engineering computer core access ()
 Jefferies tube
 23M ()
The Chief Engineer's office may be located on this deck. ()

 Decks 37 to 41
 Antiproton injection subsystem (, display graphic)

 Deck 38
 Jefferies tube
 N-11 ()
 N-95 () - external sensors
 Cargo bays
 Cargo Bay 3 ()

 Deck 39 ()
 Cargo bays
 Cargo Bay 12 ()

 Deck 42
 Antimatter chamber (, display graphic)
 Antimatter storage ()

 Deck 43 ()

 Unknown decks
  ()