Certain members
The following planets are definitely members of the United Federation of Planets.
- Althos IV
- Alpha Centauri Colony
- Andoria
- Arbazan
- Arcadia
- Ardana
- Argelius II
- Betazed
- Bolarus IX
- Cait
- Coridan
- Delta IV
- Earth
- Efros
- Fillandia
- Grazer
- Izar Colony
- Kashet
- Peliar Zel
- Tellar
- Terra Nova Colony
- Trill
- Vulcan
- Xelata
- Zaran II
Probable members
These planets are probably also Federation members.
- Aaamazzara
- Altair IV
- Angel I
- Angosia III
- Antede III
- Antica
- Antos IV
- Arcturus IV
- Arkaria
- Arken II
- Aurelia
- Benzar
- Berellia
- Berengaria
- Betelgeuse II
- Bilana III
- Bre'el IV
- Bynaus
- Cairn
- Catulla
- Corvan II
- Cygnet XIV
- Delb II
- Deneb IV
- Deneb V
- Elaysia
- Gallam
- Gaspar VII
- Halii
- Hekaras II
- K'norm
- Katarus
- Kazar
- Kobheeria
- Medusa
- Megara
- Napea
- O'Ryan's Planet
- Rhaandaran
- Risa
- Sauria
- Selay
- Sigma Iotia II
- Tanuga IV
- Tessen III
- Tiburon
- Tyrellia
- Zalda
Possible members
These planets might be Federation members, but we can't be sure.
- Aldebaran III
- Andros III
- Antares IV
- Argosia
- Atrea IV
- Halana
- Ithen (possible future timeline)
- Qo'noS (possible future timeline)
- Rigel IV
- Rigel V
- Ullia
- Zakdorn