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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[]

Table of Contents: 0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z


A[]

planet/system state species admitted notes
Aaamazzara Aaamazzarite Confirmed member in ST reference: Star Charts.
aia'Hnnrihstei Moon with Starfleet outpost in TOS novel: The Wounded Sky
Alaj Alajian TNG novel: Exiles
Aldebaran III 2216 Confirmed member in ST reference: Star Trek Maps
Algolia/Algol II Algolian Confirmed in TNG novel: Qpid
Alonis Alonis 2336 Confirmed in ST novel: Articles of the Federation and DS9 - Mission Gamma novel: Twilight
Alpha III Human colony 2163 Confirmed in ST reference: Star Trek Maps
Alpha Centauri Alpha Centauri Concordium Alpha Centauran 2161 Confirmed member inST novel: Articles of the Federation
Alpha Proxima II Confirmed member in TOS - The Brave and the Bold, Book One novella: The First Artifact
Altair Altair Quadrant Palkeo Est Confirmed member in TOS - Fortunes of War novel: Dreadnought!
Althos IV Bzzit Khaht 2279 Confirmed member in TOS module: Star Trek IV Sourcebook Update
Andor Andorian Empire Andorian 2161
2385
Confirmed in ENT - The Romulan War novel: To Brave the Storm. Seceded in 2382 following political tensions with the Federation, readmitted in 2385. (The Fall novel: Peaceable Kingdoms)
Andros III Confirmed in DS9 episode: "In the Cards"
Antares Camborn Sector Alliance Antaran Confirmed member in ST reference: Star Trek Maps
Antede III Antedean Confirmed member in ST novel: Articles of the Federation
Antos IV Antosian Confirmed member in ST reference: Star Trek Maps
Arbaza/Arbazan Arbazan Confirmed member in DS9 episode: "The Forsaken"
Arcadia Arcadian 2286 Confirmed member in Star Trek IV Sourcebook Update
Arcturus IV Arcturian Confirmed member in TOS movie & novelization: The Motion Picture
Ardana Plutocracy of Ardana Ardanan 2263 Confirmed member in Star Trek Maps and The Cloud Minders, Details per Star Charts
Argelius II Argelian 2230 - Confirmed member in Star Trek Maps and Wolf in the Fold
Arken II Arkenite 2165 Confirmed member in the TOS module: Star Trek IV Sourcebook Update. Date from the ENT - Rise of the Federation novel: Uncertain Logic.
Aronnia Aronnian 2253 Confirmed member in TOS novel: Where Sea Meets Sky.
Aulac Aulacri Confirmed member in TOS novel: Ex Machina.
Aurelia Aurelian 2248 Confirmed member in Star Trek Maps, TAS episode: "Yesteryear", and TNG episode: "Chains of Command"
Axanar Axanarri Confirmed member in Star Trek Maps

B[]

MAJOR SPOILERS
WARNING! This article contains MAJOR spoilers for the recently released episode Die Trying. Caution is advised.
planet/system state species admitted notes
Bajor Republic of Bajor Bajoran 2376/2384 2376 admission into the Federation depicted in Unity. 2384 application acceptance depicted in The Path to 2409, with full admittance in 2393.
Barzan II Barzanian Planetary Republic Barzan early 25th century Admission date confirmed in DSC episode: "Die Trying".
Benzar Benzite 2369 Confirmed member in Articles of the Federation and Coming of Age
Berengaria VII Human colony Confirmed member in ST reference: Worlds of the Federation
Beta Ophiuchi Confirmed member in Star Trek Maps
Betazed Fifth House of Betazed Betazoid 2273 Confirmed member in Triangle: Imzadi II, details per Star Charts
Betelgeuse II Betelgeusian 2230 Confirmed member in The Motion Picture
Bilana III Bilannan Confirmed member in ST references: The Star Trek Encyclopedia, Star Charts
Binderia Binderian STA novel: Gauntlet
Bolarus Bolian 23rd century Confirmed in Decipher module: Worlds
Bre'el IV Bre'ella Confirmed member in Articles of the Federation
Buran Burani 2369 Confirmed in TNG novel: The Death of Princes
Bynaus Bynar Confirmed member in 10 is Better Than 01

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[]

planet/system state species admitted notes
Damiano Damiani 2341 Confirmed member in Articles of the Federation
Danter Danteri Empire Danteri Confirmed member in House of Cards
Daran V/Kachissat Shesshran Confirmed member in Star Trek Maps
Dedderai Dedderac Confirmed member in Darkness and Starfleet: Year One
Delb II Delbian Confirmed member in ST reference: Star Charts
Delta IV Deltan Union Deltan 2223 Confirmed member in Star Trek IV Sourcebook Update and Star Trek Maps, Details per Star Charts
Delta Sigma IV Bader, Dorset Confirmed member in A Time to Love and A Time to Hate
Deneb II Details per The Worlds of the Federation
Deneb IV Bandi Bandi 2364 Details per Star Charts
Deneb V Commonwealth of Denebia Denebian 2259 Details per Star Charts
Deneva Deneva Colony Human colony Confirmed member in TNG novel: Losing the Peace.
Denobula Triaxa Denobulan 2180 Confirmed member in In a Mirror, Darkly
Djana Djanai (including Inari) Confirmed member in The Lost Years
Dramia Dramian Confirmed member in ST reference: Star Charts.

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.
MAJOR SPOILERS
WARNING! This article contains MAJOR spoilers for the recently released episode Sa'Kul. Caution is advised.

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.

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[]

planet/system state species admitted notes
Tandar Prime Tandaran 2320s Confirmed member in DTI novel: Watching the Clock.
Tarsus II Tarsusian 2268 Joined in TOS comic: "Day of the Inquisitors".
Tau Ceti III Kaferian before 2378 Confirmed member in ST reference: Star Charts.
Tellar United Planets of Tellar Tellarite 2161 Confirmed founding member in Zero Hour
Terra Nova Terra Nova Colony Novan 2178 Confirmed member in ST reference: Star Charts.
Tessen III Tessenite Confirmed member in ST reference: Star Charts.
Tenara Human (Tenaran) Confirmed member in The Captains' Honor
Theta Kiokis II Details per The Worlds of the Federation
Tiburon Tiburon 2190 Confirmed member in ST novel: Articles of the Federation. and Star Trek Maps
Triex Triexian Confirmed member in ST novel: Articles of the Federation.
Trillius Prime (Trill) Trill Symbiosis Trill 2285 Confirmed member in ST reference: Star Charts.
Tyrellia Tyrellian Confirmed member in ST reference: Star Charts.

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 module: Star Trek IV Sourcebook Update.
Xindi Rulling Council Xindi Confirmed member in ENT episodes: "Azati Prime", ST reference: Federation: The First 150 YearsTNG 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 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)


Spoiler warning: Plot and/or ending details follow: The following content contains spoilers!
MAJOR SPOILERS
WARNING! This article contains MAJOR spoilers for the recently released episode Die Trying. Caution is advised.

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")

Appendices[]

References[]

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