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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)

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 Alpha Centauri, a former United Earth colony, 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)

The novel Starfleet: Year One, published before Enterprise canologically confirmed the founding members of the Federation, gave eight founding worlds; Earth, Vulcan, Andor and Tellar remain, Alpha Centauri is omitted and Osadj, Dedderai, Vobilin and, last to agree to join, Rigel IV, are 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 Star Trek 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.

Federation members (A-Z)

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 The Motion Picture
aia'Hnnrihstei	-	-	-	-
Alaj	-	-	-	Confirmed member in Exiles
Aldebaran III	-	-	2216	- Confirmed member in Star Trek Maps
Alesia Prime	-	-	2341	Confirmed member in LUG
Algolia/Algol II	-	Algolian	-	Confirmed member in Qpid
Alonis	-	Alonis	2336	Confirmed member in Articles of the Federation and Twilight
Alpha III	-	Human colony	2163	Confirmed member in Star Trek Maps
Alpha Centauri	-	Alpha Centauran	2161	Confirmed member in Articles of the Federation
Alpha Proxima II	-	-	-	Confirmed member in The Brave and the Bold
Altair	Altair Quadrant	Palkeo Est	-	-
Althos IV	-	Bzzit Khaht	2279	Confirmed member in Star Trek IV Sourcebook Update
Andor	Andorian Empire	Andorian	2161	Confirmed member in Articles of the Federation
Andros III	-	-	-	-
Antares	Camborn Sector Alliance	Antaran	-	- Confirmed member in Star Trek Maps
Antede III	-	Antedean	-	Confirmed member in Articles of the Federation
Antia	-	-	-	-
Antos IV	-	Antosian	-	Confirmed member in Star Trek Maps
Arbaza/Arbazan	-	Arbazan	-	Confirmed member in The Forsaken
Arcadia	-	Arcadian	2286	Confirmed member in Star Trek IV Sourcebook Update
Arcturus IV	-	Arcturian	-	Confirmed member in The Motion Picture
Ardana	Plutocracy of Ardana	Ardanan	2263	Confirmed member in Star Trek Maps and The Cloud Minders, Details per Star Trek: Star Charts
Argelius II	-	Argelian	2230	- Confirmed member in Star Trek Maps and Wolf in the Fold
Arkaria	-	Arkarian	-	-
Arken II	-	Arkenite	-	Confirmed member in Star Trek IV Sourcebook Update
Aronnia	-	Aronnian	2253	Confirmed member in Where Sea Meets Sky
Ataj	-	-	2357	-
Arteline IV	-	-	2362	-
Atrea IV	-	Atrean	-	-
Aulac	-	Aulacri	-	-
Aurelia	-	Aurelian	2248	Confirmed member in Star Trek Maps, Yesteryear, and Chains of Command
Axanar	-	Axanarri	-	Confirmed member in Star Trek Maps

B

Planet/System	State	Species	Admitted	Notes
Bajor	Republic of Bajor	Bajoran	2376	Admission into the Federation depicted in Unity
Barisa Prime	-	Human colony near Peliar Zel	-	-
Benzar	-	Benzite	2369	Confirmed member in Articles of the Federation and Coming of Age
Berellia	-	-	-	-
Berengaria	-	Human colony	-	-
Beta Ophiuchi	-	-	-	Confirmed member in Star Trek Maps
Betazed	Fifth House of Betazed	Betazoid	2273	Confirmed member in Triangle, Details per Star Trek: Star Charts
Betelgeuse II	-	Betelgeusian	2230	Confirmed member in The Motion Picture
Bilana	-	-	-	-
Binderia	-	Binderian	-	-
Bolarus	-	Bolian	-	Confirmed member in Articles of the Federation and The Forsaken
Bre'el IV	-	-	-	Confirmed member in Articles of the Federation
Brikar	-	Brikarian	-	-
Buran	-	Burani	-	Confirmed member in The Death of Princes
Bynaus	-	Bynar	-	Confirmed member in 10 is Better Than 01

C

Planet/System	State	Species	Admitted	Notes
Cairn	-	Cairn	-	-
Cait	-	Caitian	2181	Confirmed member in Articles of the Federation, Star Trek IV Sourcebook Update , and Star Trek Maps
Candelar IV	-	Candelaran	-	Confirmed member in Deny Thy Father
Canopus	-	-	-	-
Catulla	-	Catullan	2185	- Confirmed member in Star Trek Maps
Cestus	Cestus III Colony	Human	2271	Details per Star Trek: Star Charts
Chal	-	Klingon/Romulan hybrids	-	Confirmed member in Avenger
-	-	Clan Ru	-	Confirmed Member in First Frontier
Coridan III	People's Republic of Coridan	Coridanite	2267	Confirmed Member in Star Trek Maps, Details per Star Trek: Star Charts
Cygnet XIV	-	-	2251	[citation needed] Confirmed member in Star Trek Maps

D

Planet/System	State	Species	Admitted	Notes
Damiano	-	Damiani	2341	Confirmed member in Articles of the Federation
Danter	Danterian Empire	Danteri	-	Confirmed member in House of Cards
Daran V/Kachissat	-	Shesshran	2237	Confirmed member in Star Trek Maps
Dedderai	-	Dedderac	-	Confirmed member in Darkness and Starfleet: Year One
Deian	-	native species	-	Confirmed member in SFB
Delb II	-	-	-	-
Delta IV	Deltan Union	Deltan	2223	Confirmed member in Star Trek IV Sourcebook Update and Star Trek Maps, Details per Star Trek: Star Charts
Delta Sigma IV	-	Bader, Dorset	-	Confirmed member in A Time to Love and A Time to Hate
Deneb IV	Bandi	Bandi	2364	Details per Star Trek: Star Charts
Deneb V	Commonwealth of Denebia	Denebian	2259	Details per Star Trek: Star Charts
Deneva	-	Human colony	-	Confirmed member in 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	-	-

E

Planet/System	State	Species	Admitted	Notes
Earth	United Earth	Human	2161	Details per Star Trek: Star Charts
Eeiauo	-	Eeiauoan	-	- Confirmed member in 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	2373	-
Eseria	-	Eseriat	-	-
Evora	-	Evoran	2375	Confirmed member in 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 The Lost Years
Gemworld	-	Elaysian, Lipul	-	Confirmed member in Articles of the Federation and Gemworld (duology)
Gnala	-	Gnalish	-	Confirmed member in Articles of the Federation
Grazer	-	Grazerite	2305	Confirmed member in Articles of the Federation
Gullrey	-	Rey	-	Confirmed member in The Great Starship Race

H

Planet/System	State	Species	Admitted	Notes
Halii	-	-	-	-
Hamal IV	-	Hamalki	-	-
Heir'ocha	-	Heir'och	-	-
Heir'tzan	-	Heiren	-	-
Hekaras II	-	-	-	-
Hermat	-	Hermat	-	Confirmed member in Articles of the Federation
Huan	-	Huanni	-	Confirmed member in Articles of the Federation

I

Planet/System	State	Species	Admitted	Notes
Igre	-	Igresh	2264	-
Ilyria	-	Human colony	-	-
Izar	Izar Colony	Human	2183	Details per Star Trek: Star Charts

J

Planet/System	State	Species	Admitted	Notes
Janus VI	-	Horta	-	Confirmed member in Articles of the Federation
Jezero	-	-	-	-
Jotunheim	-	-	-	Confirmed member in From the Depths

K

Planet/System	State	Species	Admitted	Notes
K'norm	-	K'normian	-	Confirmed member in The Motion Picture
Kandilkar	-	-	-	-
Kashet	-	Kasheeta	-	Confirmed member in Star Trek IV Sourcebook Update
Kazar	-	Kazarite	-	Confirmed member in The Motion Picture
Kerovi	-	-	-	Confirmed member in Old Wounds
Klaestron IV	-	Klaestron	-	-
Koa (Mu Arae)	-	Koa	2380	Admission into the Federation depicted in Articles of the Federation
Kobheeria	-	Kobheerian	-	Confirmed member in Second Skin
Krios	-	Kriosian	-	-
Ktar (Ktaris)	-	Ktarian	-	-

L

Planet/System	State	Species	Admitted	Notes
Legara IV	-	Legaran	-	-
Lrru-Ir	-	Irriol	-	-
Lumeria	-	-	-	-
Luna	Luna Colonies	Human	2161	Charter member at formation of the Federation (Star Trek: Star Charts)

M

Planet/System	State	Species	Admitted	Notes
Magna Roma	-	Magna Roman	-	Confirmed member in The Captains' Honor
Makkus	-	Makkusians	-	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	2161	Early Federation Member State (ST reference: Star Charts, TNG novel: The Genesis Wave, Book 1)
Medusa	-	Medusan	-	- Confirmed member in Star Trek Maps and Is There in Truth No Beauty?
Megara	-	Megarite	-	Confirmed member in The Motion Picture
Menk	Commonwealth of Menk and Valakis	[[Menk] and Valakian	2236	Details per Star Trek: Star Charts
Merak II	-	Merakan	-	Confirmed member in Star Trek Maps, Details per The Worlds of the Federation
Mizar II	-	Mizarian	-	-
Monchezke	-	Monchezke	-	-

N

Planet/System	State	Species	Admitted	Notes
Nador	-	-	2267	-
Napea	-	Napean	2334	-
Nasat	-	Nasat	-	Confirmed member in Articles of the Federation
New Paris	-	-	-	-

O

Planet/System	State	Species	Admitted	Notes
Ontail (Ona)	-	Ontailian	-	Confirmed member in Articles of the Federation and TNG #68
Oriki	-	Oriki		Confirmed member in Vulcan's Heart
Orodanga	-	Ithenite	-	Confirmed member in Journey to Babel
Osadj	-	Osadjani	-	Confirmed member in Starfleet: Year One

P

Planet/System	State	Species	Admitted	Notes
Pacifica	-	Selkie	-	-
-	-	Pahkwa-thanh	2360	-
Pandril	-	Pandrilite	-	Confirmed member in Articles of the Federation
Pandro	-	Pandronian	-	-
Pangea	-	-	-	-
Peliar Zel II	-	Peliar	-	Confirmed member in The Host
Penzatti	-	Penzatti	-	Confirmed member in Vendetta
Phylos	-	Phylosian	-	-

R

Planet/System	State	Species	Admitted	Notes
Ramatis III	-	Ramatian	-	Confirmed member in Star Trek: Destiny: Gods of Night. All life on Ramatis was destroyed by the Borg in that same novel. Whether or not the Ramatisian state continued to exist with a government-in-exile that somehow survived the Borg attack is unknown.
Rasiinia	-	Rasiinian	-	-
Rhaandarel (Rhaandaran)	-	Rhaandarite	-	Confirmed member in The Voyage Home
Rigel	Aggregation of Rigellian Systems	-	-	[citation needed]
Rigel system	United Rigel Colonies	Rigelian	2202	Details per Star Trek: Star Charts
Risa	Risian Hedony	Risian	2249	Confirmed member in Captain's Holiday, Details per Star Trek: Star Charts

S

Planet/System	State	Species	Admitted	Notes
S'ti'ach'aas	-	[[S'ti'ach	-	-
Sakerion	-	-	-	-
Sauria	-	Saurian	-	Confirmed member in The Motion Picture
Selene	-	Selenean	-	Confirmed member in Sword of Damocles
Selelvia	-	Selelvian	-	Left the Federation in 2376. Confirmed former member in Articles of the Federation
Sherman's Planet	Sherman's Planet Joint Administrative Territory	Human/Klingon	-	Also part of the Klingon Empire. Details per Star Trek: Star Charts
Shamin/O'Ryan's Planet	-	Shamin	-	Confirmed member in The Motion Picture
Sigma Iotia II	-	Iotian	[[]]	Confirmed member in The Lost Years
Skorr	-	Skorr	-	-
Ssan	-	Ssan	-	Confirmed member in Shadows on the Sun
Sulamid	-	Sulamid	-	Confirmed member in Articles of the Federation

T

Planet/System	State	Species	Admitted	Notes
Ta'Trosha IV	-	-	2362	Confirmed member in Exiles
Terra Nova	Terra Nove Colony	Novan	2178	Details per Star Trek: Star Charts
Tessen III	-	-	-	-
Tellar	United Planets of Tellar	Tellarite	2161	Confirmed member in Articles of the Federation
Tenara	-	-	-	Confirmed member in The Captains' Honor
Tiburon	-	Tiburon	2190	Confirmed member in Articles of the Federation and Star Trek Maps
Triex	-	Triexian	-	Confirmed member in Articles of the Federation
Trill	Trill Symbiosis	Trill	2285	Details per Star Trek: Star Charts
Tyrellia	-	Tyrellian	-	-
Tyrus	-	-	-	-

U

Planet/System	State	Species	Admitted	Notes
Ullia	-	Ullian	-	-

V

Planet/System	State	Species	Admitted	Notes
Vair	-	-	2370	-
Valt Minor	-	Valtese	-	-
Valzhan	-	Valzhan	2268	Confirmed member in (SCE eBook: Where Time Stands Still)
Vega IX	-	Human colony	2164	Confirmed member in Star Trek Maps
n/a	-	Vemlan	-	Confirmed member in Spartacus
Vestios system	-	Vestian	2310	Confirmed member in Burning Dreams
Vobilin	-	Vobilite	-	Confirmed member in Starfleet: Year One
Vorgon	-	-	2359	Confirmed member in Exiles
Vulcan	Confederacy of Vulcan	Vulcan	2161	Confirmed member in Articles of the Federation

X

Planet/System	State	Species	Admitted	Notes
Xelata	-	Xelatian	-	Confirmed member in Star Trek IV Sourcebook Update

Z

Planet/System	State	Species	Admitted	Notes
Zakdorn	-	Zakdorn	2344	Confirmed member in Articles of the Federation and Peak Performance
Zalda (Zald)	-	Zaldan	2280	Confirmed member in Articles of the Federation
Zaran II	-	Zaran	-	Confirmed member in Star Trek IV Sourcebook Update
Zeos	-	Zeosian	-	-