Federation members

The membership of the United Federation of Planets consisted of worlds and species with shared principles of universal liberty, rights, and equality. ()
At its founding in 2161, the Federation began with four members: Earth, Andoria, and Tellar Prime. ()
All members of the Federation had a voice in its governance. ()
By 2373, the Federation consisted of at least one hundred and fifty member planets, spread over eight thousand light years. ()
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. ()
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 and Ni'Var rejoining the Federation, leading to membership numbering at 60 in 3190. () After the 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. ()
== Federation planets ==
===Founding members===
The United Federation of Planets was founded in 2161 by the following members:
;Andoria : Homeworld of the Andorians and the Andorian Empire. () By 3190, they had left, but talks to rejoin commenced after the DMA crisis. ()
;Earth : Homeworld of the Humans and United Earth; left the Federation following the Burn in 3089. (; ) Voiced intent to rejoin in 3190. ()
;Tellar Prime : Homeworld of the Tellarites. () They were the only founding member that never left into the 32nd century. ()
; : 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. (; ; )
=== Council members ===
The following are members of the Federation who are known to be on the Federation Council.
;Arcadian homeworld : Homeworld of the Arcadians. ()
;Ariolo homeworld : Homeworld of the Ariolo. ()
;Bzzit Khaht homeworld : Homeworld of the Bzzit Khaht. ()
;Caitian homeworld : Homeworld of the Caitians. ()
;Delta IV : Homeworld of the Deltans. ()
;Efrosian homeworld : Homeworld of the Efrosians. ()
;Grazerite homeworld : Homeworld of the Grazerites. ()
;Kasheeta homeworld : Homeworld of the Kasheeta. ()
;Unnamed Federation planet : Home to the unnamed alien council members. ()
;Xelatian homeworld : Homeworld of the Xelatians. ()
;Zaranite homeworld : Homeworld of the Zaranites. (; ; )
=== Other known members ===
;Algolian homeworld : Homeworld of the Algolians. ()
;Arbazan homeworld : Homeworld of the Arbazan. ()
;Ardana : Homeworld of the Ardanans. ()
;Barzan II : Homeworld of the Barzan. ()
;Benzar : Homeworld of the Benzites. ()
;Betazed : Homeworld of the Betazoids. ()
;Bolarus IX : Homeworld of the Bolians. (; )
;Corazonia: Homeworld of the Corazonians. ()
;Coridan : Homeworld of the Coridanites. ()
;Gelrak V : Homeworld of the Gelrakians. ()
;Haliian homeworld : Homeworld of the Haliians. ()
;Hekaras II : Homeworld of the Hekarans. ()
;Kaminar : Homeworld of the Kelpiens and the Ba'ul. ()
;Peliar Zel II : Homeworld of the Pelians. ()
;Rigel IV : Homeworld of the Rigellians. ()
;Risa : Homeworld of the Risians. ()
; : Homeworld of the Trill. ()
;Unnamed Federation planet : Home to the unnamed alien ambassadors. ()
;Unnamed Federation planet : Home to the unnamed copper-skinned aliens. ()
;Unnamed Federation planet : Home to the unnamed cross-dressing delegates. ()
;Unnamed Federation planet : Home to the unnamed female delegates. ()
;Unnamed Federation planet : Home to Volis' species. ()
;Unnamed Federation planet : Home to the unnamed brown-skinned delegates. ()
;Zakdorn homeworld : Homeworld of the Zakdorn. ()
;Zelonite homeworld : Homeworld of the Zelonites. ()
Furthermore, Ithenite, Klingons, and Xindi were mentioned by as part of the Federation in a possible 26th century. ()
=== Protectorates ===
;Evora homeworld : Homeworld of the Evora. ()
;Coppelius (also called Ghulion IV): Homeworld of the Coppelius androids. ()
=== Colonies ===
=== Proposed members ===
These following were in the process of gaining Federation member status as of the year indicated.
;Angosia III (2366): Homeworld of the Angosians. ()
;Antede III (2365): Homeworld of the Antedians. ()
;Antica (2364): Homeworld of the Anticans. ()
;Bajor (2373): Homeworld of the Bajorans. ()
;Cairn homeworld (2370): Homeworld of the Cairn. ()
;Catulla (2269): Homeworld of the Catullans. ()
;Ferenginar (2381): Homeworld of the Ferengi. ()
; (2268): Homeworld of the Gideon and the Gideon Council. ()
;Kesprytt III (2370): Homeworld of the Kesprytt and the and Prytt governments. ()
; (2364): Homeworld of the Selay. ()
=== Uninhabitable ===
* Galorndon Core
== Appendices ==
=== Related topics ===
* Federation colonies
* Species with representatives in Starfleet
* Coalition of Planets
=== Background information===
In , 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 , in the alternate reality, the Federation had one hundred twenty member planets and seven hundred colonies in the 2250s. 
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 might be a member. Bilana III was also identified as a member in the and Star Trek: Star Charts. In Star Trek Onlines 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.
 introduced the idea of "Federation aligned species", though no examples were given. According to , by 2399 thousands of species depended on the Federation for unity and cohesion.
===External links===
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