This post got me thinking about the actual location inside the ship of several areas. Sure, there are many blueprints and reference books that have published complete and detailed layouts of the Enterprise. But ultimately, they're interpretations of different authors, filling in the blanks, and they often disagree with each other.
So this is a list of the bare minimum of facts. All the deck locations that can be gleaned from TOS episodes. Beyond that, it's up to anyone's imagination.
*Feel free to make additions or corrections to this post. This is only in reference to the original ship as seen in the series, not taking into account the refit ship from the movies, or alterations/retcons introduced in later series.
Saucer section (primary hull)
Most locations seen in the series belong to this section (as deduced from the curved corridors).
The first version of the Writer's Guide tell us it has 20 decks. The later edition (season 2 onwards) reduced the decks to 11.
-Bridge: Obvious from a simple inspection of the ship's exterior. And also confirmed by the Writer's Guide to be in this deck.
-The Romulan Commander's "guest" quarters: Spock tells the turbolift to bring them to this deck, before leaving her in detention, in "The Enterprise Incident". I don't think we ever see other location said to be here (maybe she got the whole deck for herself; lucky!).
-Recreation room 6: Rand offers Charlie to come here, in "Charlie X".
-Recreation room 3: Spock says Bele is chasing Lokai in front of this place, in "Let That Be Your Last Battlefield".
-Crewmen's lounge: Same as above.
-Environmental control: Scotty says power's been shut down here, in "The Ultimate Computer".
-Living quarters: Kirk confirms this, in "The Ultimate Computer".
-Sickbay: Kirk brings Spock to this deck after ordering him to report to sickbay, in "Amok Time". He does the same with Elaan of Troyius. Strangely enough, most blueprints place sickbay in deck 7 instead.
-Kirk's quarters: Confirmed in "Journey to Babel", which also shows the cabin number (3F 121). The same number was first seen in "The Conscience of the King", but without specifying the deck.
-Recreation room 3: Spock says Bele is chasing Lokai in front of this place, in "Let That Be Your Last Battlefield". May be a script error, since a moment ago he had said this place was in deck 3.
-Transporter room: As Lokai seems to run directly here, we may assume it's also in deck 5 (though there are probably many more transporter rooms throughout the ship).
-Briefing room: Sargon calls McCoy from here, in "Return to Tomorrow". May be the same briefing room from other episodes.
-Guest rooms: Bele and Lokai are assigned quarters here, in "Let That Be Your Last Battlefield".
-Living quarters: Kirk confirms this, in "The Ultimate Computer".
-Auxiliary control: The android Norman hijacks the controls here, in "I, Mudd".
-Evaluation laboratory: Seen on a plaque, in "And the Children Shall Lead". Kirk and Spock arrived on this deck in search for Auxiliary control, so it should be in deck 8 as well.
-Janice Rand's quarters: In "The Enemy Within", after seeing Rand attacked by evil Kirk, a crewman reports they're in deck 12. The number of her cabin is also visible (3C 46).
-Kirk's quarters: In very early episodes ("Mudd's Women" and "The Enemy Within"), Kirk's quarters were here, instead of in deck 5. Since the number of saucer decks was reduced to 11 in season 2, the change makes sense.
-Transporter room: In "Dagger of the Mind", Dr. Van Gelder is locked in this deck, after arriving inside a cargo box.
-Personnel Director office: Seen on a plaque during Van Gelder's escape.
-Science Library: Same as above.
These are some locations, likely from the saucer section, but with unspecified deck. There are plenty of such examples, so this isn't an exhaustive list.
-Impulse engines: The Writer's Guide confirms that the impulse engines are in the primary hull, in case of saucer separation. I think the impulse engines are only seen in "The Doomsday Machine", when Scotty is working aboard the identical Constellation. Though they look just as a reused set from Engineering.
-Spock's quarters: The cabin number is seen in "Amok Time" (3F 125). Possibly, it's in deck 5 near Kirk's quarters, considering the similar numbering.
-McCoy's quarters: Only seen in "The Man Trap" (I think), which also shows the number (3F 127). Again, it's probably near Kirk and Spock's cabins.
-Mudd's quarters: The number is barely legible, but looks like 3F 125, in "Mudd's Women". This happens to be the same as Spock's cabin. The likely explanation is that they didn't have a design for Spock's quarters so early in the series. The fun explanation is that they evicted Spock just to make room for Mudd.
-Uhura's quarters: Seen in "The Tholian Web", and adapted for Elaan in "Elaan of Troyius".
-Scotty's quarters: Seen in "By Any Other Name".
-Life Science Section - Botany Department: Seen in "The Man Trap".
-Gymnasium: Seen in "Charlie X".
-Officer's mess: Seen in "Space Seed".
-Botanical garden: Seen in "Is There in Truth No Beauty?".
-Briefing room: Different from the usual briefing room, it's seen in "Space Seed" when they decide Khan's fate.
-Biochemistry lab: Seen in "The Deadly Years".
Since I've reached the picture limit, the continuation with the Engineering hull sets will be in another post, here.
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