Memory Alpha
Memory Alpha
The Insignia of the United Federation of Planets

The membership of the United Federation of Planets consisted of worlds and species with shared principles of universal liberty, rights and equality. (PRO: "Starstruck")

At its founding in 2161, the Federation began with four members: Earth, Andoria, Vulcan and Tellar Prime. (ENT: "These Are the Voyages...")

By 2373, the Federation consisted of at least one hundred and fifty member planets, spread over eight thousand light years. (Star Trek: First Contact)

At its peak, the Federation included 350 member worlds. By 3189, as a result of The Burn, there were only 38 known to Federation Headquarters. (DIS: "Die Trying")

After the cause of The Burn was discovered, the Emerald Chain crippled, and a planet made of Dilithium was discovered, the Federation began to rebuild with worlds such as Trill and Ni'Var rejoining the Federation, leading to membership numbering at 60 in 3190. (DIS: "All Is Possible") After the USS Discovery made contact with Species 10-C, additional worlds opened negotiations to join or rejoin. Such as Andoria who began talks and Earth who were ready to rejoin immediately. (DIS: "Coming Home")

Presumably the admission policy of the Federation regards governments and/or planets, and not whole species. In practice, a planet had to be unified under one joint government until it can apply for Federation membership. However, there were potential exceptions, such as the Kes.

Federation planets

Founding members

The Founding Ceremony

The United Federation of Planets was founded in 2161 by the following members:

Homeworld of the Andorians and the Andorian Empire. (ENT: "Zero Hour", "These Are the Voyages...") By 3190, they had left, but talks to rejoin commenced after the DMA crisis. (DIS: "Coming Home")
Homeworld of the Humans and United Earth; left the Federation following the Burn in 3089. (ENT: "Zero Hour", "These Are the Voyages..."; DIS: "People of Earth") Voiced intent to rejoin in 3190. (DIS: "Coming Home")
Tellar Prime
Homeworld of the Tellarites. (ENT: "Zero Hour", "These Are the Voyages...") They were the only founding member that never left into the 32nd century. (DIS: "Coming Home")
Homeworld of the Vulcans and the Vulcan High Command. Planet renamed to Ni'Var following Vulcan-Romulan reunification; left the Federation following the Burn in 3089, and rejoined in 3190. (TNG: "Gambit, Part II"; ENT: "Zero Hour", "These Are the Voyages..."; DIS: "Unification III", "All Is Possible")
According to several background sources, including the Star Fleet Technical Manual, Star Trek: Star Charts, "It's Federation Day!", a newspaper article created as background material for Star Trek Generations, and the novels Articles of the Federation and Star Trek: Enterprise - Rise of the Federation: A Choice of Futures, the independent Alpha Centauri was the fifth original founding member of the Federation. In the Star Fleet Technical Manual, the formal name of the Alpha Centauri state is the Alpha Centauri Concordium of Planets (β); in Rise of the Federation, it is known simply as the Alpha Centauri Concordium.

In the Star Fleet Technical Manual, the formal name of the Vulcan state is given as the Planetary Confederation of 40 Eridani. In the ENT novel Kobayashi Maru and the subsequent Rise of the Federation series, it is known as the Confederacy of Vulcan (β). In Star Trek: Star Charts, it is the Confederacy of Surak. This name is also used for the surviving Vulcan state in the Alternate reality, as seen on wallscreens in Star Trek Into Darkness.

In the Star Fleet Technical Manual, the Tellarite state is given as the United Planets of 61 Cygni. In Rise of the Federtion, it is known as the United Planets of Tellar (β).

Council members

The Federation Council

The following are members of the Federation who are known to be on the Federation Council.

Arcadian homeworld
Homeworld of the Arcadians. (Star Trek IV: The Voyage Home)
Ariolo homeworld
Homeworld of the Ariolo. (Star Trek IV: The Voyage Home)
Bzzit Khaht homeworld
Homeworld of the Bzzit Khaht. (Star Trek IV: The Voyage Home)
Caitian homeworld
Homeworld of the Caitians. (Star Trek IV: The Voyage Home)
Delta IV
Homeworld of the Deltans. (Star Trek IV: The Voyage Home)

Jaresh-Inyo, the Grazerite Federation President in 2372

Grazerite homeworld
Homeworld of the Grazerites. (DS9: "Homefront")
Kasheeta homeworld
Homeworld of the Kasheeta. (Star Trek IV: The Voyage Home)
Unnamed Federation planet
Home to the unnamed alien council members. (Star Trek IV: The Voyage Home)
The hat props worn by these aliens were presumably mistakenly cataloged under the species name Kazarites, though the costumes named them as Mazorites. [1] [2] See also: Mazarites.
Xelatian homeworld
Homeworld of the Xelatians. (Star Trek IV: The Voyage Home)
Zaranite homeworld
Homeworld of the Zaranites. (Star Trek: The Motion Picture; Star Trek IV: The Voyage Home; Star Trek VI: The Undiscovered Country)

Other known members

Algolian homeworld
Homeworld of the Algolians. (TNG: "Qpid")
Based on them having a seat on the Federation Archaeology Council.
Arbazan homeworld
Homeworld of the Arbazan. (DS9: "The Forsaken")
Based on an Arbazan holding the position of ambassador.
Homeworld of the Ardanans. (TOS: "The Cloud Minders")
Barzan II
Homeworld of the Barzan. (DIS: "Die Trying")
Homeworld of the Benzites. (TNG: "Coming of Age")
Homeworld of the Betazoids. (TNG: "Haven")
Bolarus IX
Homeworld of the Bolians. (TNG: "Qpid"; DS9: "The Forsaken")
Based on them also having a seat on the Federation Archaeology Council.

Ambassadors Sarek and Gav discuss Coridanite's admission into the Federation in 2268

Homeworld of the Coridanites. (TNG: "Sarek")
Efrosian homeworld
Homeworld of the Efrosians. (Star Trek VI: The Undiscovered Country)
Based on one being Federation President.
Gelrak V
Homeworld of the Gelrakians. (LD: "Temporal Edict")
Haliian homeworld
Homeworld of the Haliians. (TNG: "Aquiel")
Hekaras II
Homeworld of the Hekarans. (TNG: "Force of Nature")
Homeworld of the Kelpiens and the Ba'ul. (DIS: "Die Trying")
Peliar Zel II
Homeworld of the Pelians. (TNG: "The Host")
Rigel IV
Homeworld of the Rigellians. (Star Trek: The Motion Picture)
Homeworld of the Risians. (TNG: "Captain's Holiday")
Homeworld of the Trill. (DIS: "That Hope Is You, Part 2")
Unnamed Federation planet
Home to the unnamed alien ambassadors. (TOS: "Journey to Babel")
Unnamed Federation planet
Home to the unnamed copper-skinned aliens. (TOS: "Journey to Babel")
An unfilmed scene from ENT: "Terra Prime" would have established these as the Ithenites mentioned in "Azati Prime". They were previously identified in Stardate magazine (issue 11) as the Dayen.
Unnamed Federation planet
Home to the unnamed cross-dressing delegates. (TOS: "Journey to Babel")
Unnamed Federation planet
Home to the unnamed female delegates. (TOS: "Journey to Babel")
Unnamed Federation planet
Home to Volis' species. (TOS: "Journey to Babel")
Unnamed Federation planet
Home to the unnamed brown-skinned delegates. (TOS: "Journey to Babel")
Zakdorn homeworld
Homeworld of the Zakdorn. (TNG: "Peak Performance")
Zelonite homeworld
Homeworld of the Zelonites. (Star Trek VI: The Undiscovered Country)
According to VOY: "The Voyager Conspiracy", Ktarians were officially "with the Federation", but it is not specified if they were members or allies.

Furthermore, Ithenite, Klingons, and Xindi were mentioned by Daniels as part of the Federation in a possible 26th century. (ENT: "Azati Prime")


Regent Cuzar at the Evora's reception

Evora homeworld
Homeworld of the Evora. (Star Trek: Insurrection)
According to a deleted scene from the end of "Insurrection", the Ba'ku planet was also to become a protectorate.
Haven was said to have a treaty with the Federation which required Starfleet to protect it, and thus may have been an official protectorate.
Coppelius (also called Ghulion IV)
Homeworld of the Coppelius androids. (PIC: "Et in Arcadia Ego, Part 2")


The exact status of Federation colonies has never been clearly established. While due to the large amount of colonies it seems unlikely that they have full member status, it would be plausible to assume that they enjoy a status not unlike to that of Federation protectorates.

Proposed members

Captain Benjamin Sisko stopping Bajor from joining the Federation

These following were in the process of gaining Federation member status as of the year indicated.

Angosia III (2366)
Homeworld of the Angosians. (TNG: "The Hunted")
Antede III (2365)
Homeworld of the Antedians. (TNG: "Manhunt")
Antica (2364)
Homeworld of the Anticans. (TNG: "Lonely Among Us")
Bajor (2373)
Homeworld of the Bajorans. (DS9: "Emissary")
Cairn homeworld (2370)
Homeworld of the Cairn. (TNG: "Dark Page")
Catulla (2269)
Homeworld of the Catullans. (TOS: "The Way to Eden")
Gideon (2268)
Homeworld of the Gideon and the Gideon Council. (TOS: "The Mark of Gideon")
Kesprytt III (2370)
Homeworld of the Kesprytt and the Kes and Prytt governments. (TNG: "Attached")
Selay (2364)
Homeworld of the Selay. (TNG: "Lonely Among Us")



Related topics

Background information

In TOS: "Journey to Babel", set in 2268, the ambassadors of Federation planets attended the Babel Conference, at that time there were thirty-two ambassadors, suggesting there were at least thirty-two member worlds in the Federation at that time.

According to a dossier on the home page of Star Trek, in the alternate reality, the Federation had one hundred twenty member planets and seven hundred colonies in the 2250s. [3]

According to Star Trek: Star Charts (United Federation of Planets IV), in 2378, there were 183 members and 7,128 affiliates. The area of the Federation was eight thousand cubic light years. At the last census, in 2370, there were 985 billion individuals living in the Federation.

Aleek-Om was identified as a "Federation historian" in the Star Trek Concordance, possibly based on the script, suggesting Aurelia might be a member. Bilana III was also identified as a member in the Star Trek Encyclopedia (4th ed., vol. 1, p. 83) and Star Trek: Star Charts. In Star Trek Online's Agents of Yesterday expansion pack, Mizar IV was the site of a Federation colony, suggesting that Mizar II is located within Federation space and holds a membership on the Federation Council.

"Magic to Make the Sanest Man Go Mad" introduced the idea of "Federation aligned species", though no examples were given. According to "Maps and Legends", by 2399 thousands of species depended on the Federation for unity and cohesion.

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