The space station Deep Space 9 had at least forty-one numbered levels, each with its own uses and characteristics. (Star Trek: Deep Space Nine)
Level two
- In 2371, Ruwon, Karina, and their Romulan companions were moved by Major Kira Nerys to level two of the habitat ring. (DS9: "Visionary")
- In late 2372, level two underwent structural repair work, necessitating the need to move the furniture to Quark's. (DS9: "Body Parts")
Level three
- A tool locker was located on level three, section five in 2369, as was runabout pad C. (DS9: "In the Hands of the Prophets")
- Worf's quarters were located on level three. (DS9: "Inquisition")
H3
Elim Garak's quarters were located in chamber 901 on this level. Doctor Julian Bashir accessed the quarters through his identification when Garak left the infirmary without explanation. (DS9: "The Wire")
Level four
- In 2369, after Commander Benjamin Sisko was informed about the kidnapping of Lieutenant Jadzia Dax, he sealed off levels four through twelve of the station. (DS9: "Dax")
Level five
Habitat ring, level five, section three
- The O'Brien family's quarters were located on level five. (DS9: "The Darkness and the Light", "Treachery, Faith and the Great River")
- Level five, section three of the habitat ring contained the weapons locker, while corridor 14-A contained a security junction. (DS9: "Captive Pursuit")
- In 2369, a power transfer grid on level five went offline, putting all upper docking pylons out of commission. (DS9: "A Man Alone")
- In 2370, the Bajoran Militia (temporarily under the control of "The Circle") started releasing anesthizine gas in level five. (DS9: "The Siege")
- In a coma after a Lethean attack, Julian Bashir encountered Altovar in his mind, in an imagined replica of level five. (DS9: "Distant Voices")
- In order to hide the modifications requested by a Pah-wraith possessing Keiko O'Brien's body, Miles O'Brien had to work on the optronic integrator on level five. (DS9: "The Assignment")
Level six
- In 2369, Julian Bashir and Jadzia Dax were attacked by the Klaestrons on level six, in corridor one. (DS9: "Dax")
Level seven
- Quark's Bar, Grill, Gaming House and Holosuite Arcade was located on level seven. (DS9: "Playing God")
Level twelve
A tritanium source at level twelve, section eight
- In 2369, after Commander Benjamin Sisko was informed about the kidnapping of Lieutenant Jadzia Dax, he sealed off the levels four through twelve. (DS9: "Dax")
- The same year the computer located a tritanium source in a power conduit in level twelve, section eight. It was the remains of Chief Miles O'Brien's EJ7 interlock, as well as the organic remains of Ensign Aquino, who was killed by Neela in this location. (DS9: "In the Hands of the Prophets")
- Sarina Douglas was assigned quarters on level twelve in 2375. (DS9: "Chrysalis")
H12
In 2369, Doctor Bashir told Ambassador Taxco that all crew quarters on the crew level were occupied and that he was not able to give her larger rooms than the guest quarters. The guest quarters were located in corridor H12-A, and were used by Ambassadors Taxco, Vadosia, and Lojal. (DS9: "The Forsaken")
Level thirteen
- In 2370, a wall on level thirteen in the habitat ring was vandalized with an emblem of the Alliance for Global Unity. That section was part of a low-security area at the time. (DS9: "The Homecoming")
Level fourteen
- Part of level fourteen contains storage bays. In 2369, these bays were empty and were damaged in a Cardassian attack. (DS9: "Emissary")
Level sixteen
- Odo ordered security teams to the docking ring, levels sixteen to twenty-one to find and arrest the kidnapping Klaestrons. (DS9: "Dax")
- Odo mentioned that he purposely had assigned himself quarters directly above Quark's. (DS9: "Crossfire")
Level seventeen
- Quark's quarters were located on level seventeen. (DS9: "Who Mourns for Morn?")
- In early 2372, Chief Miles O'Brien and his team phaser swept all of level seventeen in a drill to find Odo. (DS9: "The Way of the Warrior")
- In 2373, a Changeling impersonating Julian Bashir used the industrial replicator on level seventeen to replicate a bomb consisting of trilithium, tekasite, and protomatter. (DS9: "By Inferno's Light")
Level eighteen
- Chief Miles O'Brien was ordered to move to level eighteen and phaser sweep the level after he finished level seventeen. (DS9: "The Way of the Warrior")
Level twenty-one
- Odo ordered security teams to the docking ring, levels sixteen to twenty-one to find and arrest the kidnapping Klaestrons. (DS9: "Dax")
- The ore processing facilities were located on this level. In 2365, Kira Nerys claimed to have been on level twenty-one when Vaatrik was killed. (DS9: "Necessary Evil")
- Section ten of this level contained a temperature control panel. In 2369, a subspace shunt to the station's computer was used to access security files through this temperature control panel. (DS9: "The Passenger")
Level twenty-two
- Level twenty-two was the location of several storage bays. Melora Pazlar was injured in the level when she fell off her wheelchair. (DS9: "Melora")
Level twenty-three
- Lwaxana Troi was on her way to level twenty-three in 2371, when she experienced a headache related to her Zanthi fever. (DS9: "Fascination")
Level twenty-nine
- When Benjamin Sisko, Miles O'Brien, and Jake Sisko climbed up from their starting point above level thirty-three, they found themselves in a loading bay where the Uridium was separated from the rock, and later in a corridor gave their location as section D on this level. (DS9: "Civil Defense")
Level thirty-three
- According to Miles O'Brien, the level on which he and Jake Sisko accidentally set off Dukat's "Bajoran worker revolt" security protocol was above level thirty-three. In that area, Uridium was processed and molten metal was sent down a chute to a secondary refinement unit on this level. (DS9: "Civil Defense")
Level thirty-four
- Control junctions for the laser fusion initiator were located on this level. (DS9: "Civil Defense")