| This article or subsection has an associated category. | Federation member states |
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The Great Seal of the United Federation of Planets.
As of December 2380, there were 154 member states of the United Federation of Planets, and Federation space spanned over 10,000 light-years. (ST novel: Articles of the Federation)
On new stardate γ 2143.21.3, the Federation celebrated the induction of all remaining space-faring civilizations of the Milky Way Galaxy. (ST novel: Federation)
By the year 1,012,260, the Mega-Federation controlled the entire galaxy, and was able to move it through intergalactic space at will. (ST - Strange New Worlds VI short story: "Our Million-Year Mission")
- See also Federation colonies.
Founding member states[]
The United Federation of Planets was founded in 2161 by the governments of United Earth, the Confederacy of Vulcan, the Andorian Empire, the United Planets of Tellar, and the Alpha Centauri Concordium, all of which were previously members of the Coalition of Planets. (TNG episode: "The Outcast"; ENT episode: "Zero Hour"; ST novel: Articles of the Federation; ENT novel: Kobayashi Maru; ST reference: Star Fleet Technical Manual)
- The novel Starfleet: Year One, published before Enterprise canonically confirmed the founding members of the Federation, gave eight founding worlds; Earth, Vulcan, Andor and Tellar remained, Alpha Centauri was omitted and Osadj, Dedderai, Vobilin and, last to agree to join, Rigel IV, were added. While these extra worlds could still be early members of the Federation, the majority of sources, and canon, now rule them out as founding members.
- Similarly, the reference book Spaceflight Chronology lists Rigel as a founding member in addition to the five listed above. In addition, in that source Alpha Centauri is a system with an indigenous (though closely related to Human) population, not an Earth colony.
Members[]
A[]
B[]
C[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Cairn | Cairn | Confirmed member in ST novel: Articles of the Federation and ST reference: Star Charts. | ||
| Cait | Caitian | 2181[citation needed] | Confirmed in ST novel: Articles of the Federation, ST reference: Star Charts and Star Trek IV Sourcebook Update | |
| Candelar IV | Candelaran | - | Confirmed member in TLE novel: Deny Thy Father | |
| Catulla | Catullan | 2185 | Confirmed member in ST reference: Star Charts. | |
| Cestus III | Cestus III Colony | Human | 2271 | Confirmed in ST reference: Star Charts. |
| Chal | Klingon/Romulan Hybrid or Chalchaj'qmey | Confirmed member in TOS novel: Avenger | ||
| - | Clan Ru | Confirmed member in TOS novel: First Frontier | ||
| Coridan III | People's Republic of Coridan | Coridanite | 2267 | Confirmed in TOS episode: "Journey to Babel", ST reference: Star Charts |
| Cygnet XIV | Cygnian | 2251 | Confirmed member in ST reference: Star Charts. |
D[]
E[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Earth | United Earth | Human | 2161 | Founding member in ENT - The Romulan War novel: To Brave the Storm. |
| Eeiauo | Eeiauoan | Confirmed member in TOS novel: Uhura's Song. | ||
| Edos | Edosian | Confirmed member in Star Trek Maps | ||
| Efros/Efros Delta/Atreos IV | Efrosian | Confirmed member in Star Trek IV Sourcebook Update | ||
| Ekos | Ekosian global federation | Ekosian | 2373 | Confirmed in Decipher RPG module: Worlds |
| Elas | Elasian | Late 24th Century | Confirmed member in TNG novel: Lost Souls. | |
| Evora | Evoran | 2375 | Confirmed in COE novel: Past Life |
F[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Fillandia | Ariolo | Confirmed member in Star Trek IV Sourcebook Update |
G[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| - | Galakhi | Confirmed member in TOS novel: The Lost Years. | ||
| Gemworld | Elaysian, Lipul | Confirmed member in TNG novel: Gemworld. | ||
| Gideon (Delta Dorado) | Gideon Council | Gideonite | prior to 2378 | Confirmed member in ST reference: Star Charts. |
| Gnala | Gnalish | Confirmed member in ST novel: Articles of the Federation. | ||
| Grazer | Grazerite | 2305 | Confirmed member in ST novel: Articles of the Federation. | |
| - | Guidon Space Pontificate | Guidon | prior to 2363 | Confirmed member in TNG - The Sky's the Limit short story: "Meet with Triumph and Disaster". |
| Gullrey | Rey | Confirmed member in TOS novel: The Great Starship Race. |
H[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Halii | Haliian | Confirmed member in TNG episode: "Aquiel". | ||
| Hamal IV | Hamalki | Confirmed member in TOS novel: The Wounded Sky. | ||
| Hekaras II | Hekaran | Confirmed member in TNG episode: "Force of Nature". | ||
| - | Hermat | Confirmed member in ST novel: Articles of the Federation. | ||
| Huan | Huanni | Confirmed member in VOY - Spirit Walk novel: Old Wounds. |
I[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Igre | Igresh | before 2364 | Confirmed member in FASA RPG module: Star Trek: The Next Generation Officer's Manual. | |
| Izar | Izar Colony | Human | 2183 | Confirmed member in ST reference: Star Charts. |
J[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Janus VI | Horta | Confirmed member in ST novel: Articles of the Federation. | ||
| Jezero | Jezero natives | before 2269 | Confirmed member in TOS novel: Death's Angel. | |
| Jotunheim | before 2270 | Confirmed member in TOS novel: From the Depths. |
K[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| K'normia | K'normian | Confirmed member in The Motion Picture | ||
| Kaferia | Kaferian | 2378 | Confirmed in Star Charts | |
| Kaminar | Kelpien and Ba'ul Alliance | Ba'ul, Kelpien | before 3064 | Confirmed member in DSC episode: "Sa'Kul". |
| Kashet | Kasheeta | Confirmed member in Star Trek IV Sourcebook Update | ||
| Kazar, Kazar system | Kazarite | Confirmed member in The Motion Picture | ||
| Kerovi | Kerovian | Confirmed member in VOY - Spirit Walk novel: Old Wounds. Left the Federation in 2378. (VOY novel: Full Circle) | ||
| Klaestron IV | Klaestron | 2378 | Confirmed in Star Charts | |
| Klingon | before 2769 | Confirmed member in STO - Future Proof mission: "Time and Tide". Member planet or state not specified. | ||
| Koa (Mu Arae) | Koas | 2380 | Admission into the Federation depicted in ST novel: Articles of the Federation. | |
| - | K'Vin Hegemony | K'Vin | 2260s | Confirmed member in TNG novel: Doomsday World. |
L[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| - | Lendrin | 2370s | Confirmed member in VOY novel: Children of the Storm. | |
| Lorillia | Lorillian | before 2381 | Confirmed member in ST - Destiny novel: Lost Souls. | |
| Lrru-Ir | Irriol Whole | Irriol | before 2379 | Confirmed member in TTN novel: Orion's Hounds. |
| Luna | Lunar Colonies | Human | 2161 | Charter member at formation of the Federation in ST reference: Star Charts. |
| Lembatta Prime | by 2380 | Confirmed member in ST novel: Articles of the Federation. |
M[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Magna Roma | Magna Roman | Confirmed member in The Captains' Honor | ||
| Makkus | Makkusian | Confirmed member in Excalibur. | ||
| Mantilles | Confirmed member in Star Trek Maps | |||
| Marcos XII | Various, Federation colony | Confirmed member in Star Trek Maps, details per The Worlds of the Federation | ||
| Mars | Confederated Martian Colonies | Human | 2162 | Confirmed in ENT - Rise of the Federation novel: A Choice of Futures |
| Medusa | Medusan | - Confirmed member in Star Trek Maps and Is There in Truth No Beauty? | ||
| Megara | Megarite | Confirmed member in The Motion Picture | ||
| Melkot | Melkot (Melkotian) | Confirmed member in The Worlds of the Federation | ||
| Menk | Commonwealth of Menk and Valakis | Menk and Valakian | 2236 | Confirmed member in ST reference: Star Charts. |
| Merak II | Merakan | Confirmed member in Star Trek Maps, details per The Worlds of the Federation | ||
| Mizar II | Mizarian | Confirmed member in Agents of Yesterday | ||
| Monchezke | Monchezkin | before 2233 | Confirmed member in ST movie & novelization: Star Trek (2009). |
N[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Nador | Nadorian | 2267 | Confirmed in TOS novel: Gemini. | |
| Napea | Napean | Confirmed member in ST reference: Star Charts. | ||
| Nasat | Nasat | before 2380 | Confirmed member in ST novel: Articles of the Federation. | |
| New Paris | Human | before 2378 | Confirmed member in ST reference: Star Charts. | |
| New Romulus | Romulan Republic | Romulan | before 2769 | Confirmed member in STO - Future Proof mission: "Time and Tide". |
| New Xannon | Xanno | 2229 | Confirmed in TOS novel: The Delta Anomaly. | |
| New Xindus | Xindi Council | Xindi | 2311 | Confirmed member in ST reference: Federation: The First 150 Years. |
| Newton II | Confirmed in TOS video game: Starfleet Academy Starship Bridge Simulator |
O[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Ontail (Ona) | Ontailian | 2374 | Confirmed member in ST novel: Articles of the Federation and TNG #68 | |
| Oriki | Oriki | Confirmed member in Vulcan's Heart | ||
| Orodanga | Ithenite | 2165 | Confirmed member in Journey to Babel, date from the ENT - Rise of the Federation novel: Patterns of Interference. | |
| Osadj | Osadjani | Confirmed member in Starfleet: Year One |
P[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Pacifica | Selkie | before 2378 | Confirmed member in ST reference: Star Charts. | |
| Pahkwa Majoris | Pahkwa-thanh | 2360 | Confirmed member in TTN novel: Orion's Hounds. | |
| Pandril | Pandrilite | Confirmed member in ST novel: Articles of the Federation. | ||
| Pangea | Human (Pangean) | Confirmed member in TNG novel: A Time for War, A Time for Peace. | ||
| Peliar Zel II | Peliar | Confirmed member in The Host | ||
| Penzatti | Penzatti | Confirmed member in Vendetta | ||
| Phylos | Phylosian | Details per The Worlds of the Federation |
R[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Ramatis III | Ramatian | Confirmed member in Star Trek: Destiny: Gods of Night. | ||
| Regulus III | Regulan | Confirmed member in ST reference: Star Charts. | ||
| Regulus V | Regulan | Confirmed member in ST reference: Star Charts. | ||
| Rhaandarel (Rhaandaran) | Rhaandarite | Confirmed member in The Voyage Home. | ||
| (Beta) Rigel system | United Rigel Worlds and Colonies | Rigelian | 2164 | Joined in ENT - Rise of the Federation novel: Tower of Babel. |
| Risa | Risian Hedony | Risian | 2249 | Confirmed member in Captain's Holiday, Details per Star Charts |
S[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| S'ti'ach'aas | S'ti'ach | Confirmed member in TTN novel: Orion's Hounds. | ||
| Sandpinia | Sandpinian | 23rd century | Confirmed member in TOS - Day of Honor novel: Treaty's Law. | |
| Sauria | Saurian | Confirmed member in The Motion Picture | ||
| Selene | Selenean | Confirmed member in TTN novel: Sword of Damocles. | ||
| Selelvia | Selelvian | Left the Federation in 2376. Confirmed former member in ST novel: Articles of the Federation. | ||
| Sherman's Planet | Sherman's Planet Joint Administrative Territory | Human/Klingon | Also part of the Klingon Empire. Details per ST reference: Star Charts. | |
| Shamin/O'Ryan's Planet | Shamin | Confirmed member in The Motion Picture | ||
| Sigma Iotia II | Iotian Syndicate[1] | Iotian | Confirmed member in The Lost Years | |
| Ssan | Ssana | Confirmed member in Shadows on the Sun | ||
| Sulamid | Sulamid | before 2380 | Confirmed member in ST novel: Articles of the Federation. |
T[]
U[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| - | Ullian Free State | Ullian | Confirmed member in TNG - Section 31 novel: Rogue. | |
| Umoth VIII | Confirmed member in ST reference: Star Charts. |
V[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Valzhan | Valzhan | 2268 | Confirmed member in SCE eBook: Where Time Stands Still). | |
| Vega IX | Vega Colony | Humans | 2164 | Joined in ENT - Rise of the Federation novel: Tower of Babel. |
| Verdanis (Terratin) | Terra 10 | mutated Humans | before 2378 | Confirmed member in ST reference: Star Charts. |
| Vestios system | Vestian | 2310 | Confirmed member in Burning Dreams | |
| Vico V | before 2378 | Confirmed member in ST reference: Star Charts. | ||
| Vobilin | Vobilite | Confirmed member in Starfleet: Year One | ||
| Vorgon | Vorgons | 2359 | Confirmed member in TNG novel: Exiles. | |
| Vulcan | Confederacy of Vulcan | Vulcan | 2161 | Confirmed founding member in ENT - Rise of the Federation novel: A Choice of Futures. |
X[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Xelata | Xelatian | Confirmed member in FASA RPG module: Star Trek IV Sourcebook Update. | ||
| Xindi Rulling Council | Xindi | Confirmed member in ENT episodes: "Azati Prime", ST reference: Federation: The First 150 Years; TNG short story: "Meet with Triumph and Disaster" |
Y[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Yridia Prime | Yridian | before 2378 | Confirmed member in ST reference: Star Charts. |
Z[]
| planet/system | state | species | admitted | notes |
|---|---|---|---|---|
| Zadar IV | before 2378 | Confirmed member in ST reference: Star Charts. | ||
| Zakdorn | Zakdorn | 2344 | Confirmed in ST novel: Articles of the Federation. | |
| Zalda (Zald) | Zaldan | 2280 | Confirmed in ST novel: Articles of the Federation. | |
| Zaran II | Zaranite | Confirmed member in FASA RPG module: Star Trek IV Sourcebook Update. | ||
| Zytchin III | before 2378 | Confirmed member in ST reference: Star Charts. |
Withdrawal from the Federation[]
Member worlds, colonies and species have occasionally left the Federation, or had their membership withdrawn.
In 2165, the Orion Syndicate manipulated public opinion on Vulcan to force them into a secession. The plan was foiled by Starfleet. (ENT - Rise of the Federation novel: Uncertain Logic)
Between the 23rd century and the 2370s, the Caitians withdrew and reapplied for Federation membership repeatedly. Cait was welcomed back each time. (NF - Gateways novel: Cold Wars)
In 2376, the revelation of manipulation in the Federation Council by the Selelvians left to the membership of their homeworld Selelvia to be revoked. This led to the Selelvian War between the Federation, the Selelvians, and their Tholian Assembly allies. (NF novel: Stone and Anvil)
In 2378, a Changeling manipulated the government of Kerovi into withdrawing from the Federation. (VOY - Spirit Walk novel: Enemy of My Enemy) Despite the revelation of foreign intervention, the Kerovian leader stuck to the decision to save face. (VOY novel: Full Circle)
Following the reallocation of refugees and resources in the wake of the Borg Invasion of 2381, several worlds threatened plebiscites on maintaining their Federation membership, chiefly Alpha Centauri IV. Following an eye-opening experience for the leader of the Alpha Centauri Concordium of Planets, the votes instead became reaffirmations of their membership. (TNG novel: Losing the Peace)
In 2382, the Andorian Empire voted to secede from the Federation. Relations were frosty and an alliance between Andoria and the hostile Typhon Pact was deemed possible. (Typhon Pact novel: Paths of Disharmony) The Andorians rejoined in 2385. (ST - The Fall novels: A Ceremony of Losses, Peaceable Kingdoms)
The re-dedication of Starfleet to undertake the evacuation of the Romulans led to 14 planets threatening withdrawal in the 2380s decade. The issue became moot in 2385 when the Wallenberg-class rescue fleet was destroyed by Synths. (PIC novel: The Last Best Hope)
Continued support for reconstruction in the Cardassian Union and Romulan successor states led to Pacifica withdrawing in protest in the 2390s. The Pacificans were unwilling to subsidize "enemies of the Federation". (STO reference: The Path to 2409)
Following a galactic cataclysm in the 3060s<ref>DSC episode: "Die Trying", the Burn, the Federation largely collapsed as a power. (DSC episode: "That Hope Is You, Part 1")
Starfleet Headquarters and Federation Headquarters left Earth soon after, and United Earth pulled out of the Federation. (DSC episode: "People of Earth") Trill also dropped out. By 3189, the Trill awaited the return of the Federation. (DSC episode: "Forget Me Not")
At that time, practised Federation membership had reduced from 350 to 38 planets. (DSC episode: "Die Trying")