In various incarnations of Star Trek, we observe the Federation founding and maintaining numerous colony worlds. These worlds are typically (though not exclusively) inhabited by humans, have a relatively low population (for example, New Providence had less than a thousand inhabitants), and typically serve as remote flashpoints or otherwise exist to portray a "frontier"-like atmosphere without technically leaving friendly space.

On the other hand, we see various worlds in various stages along the path to full member-world status in the United Federation of Planets (UFP). What I noticed about these candidates, however, is that they are the homeworlds of civilizations, such as Bajor and the homeworld of the Evora, not previous Federation colony worlds that have expanded beyond "colony" status.

Can a Federation colony gain full member world status in the UFP, or is membership only granted to the homeworlds of civilizations (with colonies, presumably, remaining under the jurisdiction of the founding member's government or the entire UFP government)?

Mentally, it is easy to compare the UFP with modern-day nations with a Federal political structure such as the USA and Canada which have followed the general model of admitting former territories to full membership upon reaching designated population, economic, or political goals, but it is not clear if the analogy is meant to go that far.

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    Why would you think that colonies aren't full-fledged members of the Federation already?
    – Kyle Jones
    Commented Jun 24, 2019 at 18:06
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    Earth's Moon, a colony of Earth, is a charter member of the UFP, as are Mars, Terra Nova and Izar. Do they count?
    – Valorum
    Commented Jun 24, 2019 at 18:08
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    @KyleJones because they are called colonies, rather than simply worlds or member worlds. When was the last time you called someone in the Oregon Country or visited the "Indian Territory" north of Texas? Those entities have long become first-class members of the USA and are now referred to as such. Commented Jun 24, 2019 at 18:08
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    @Valorum yes, those would count if you can point to a source identifying them as Federation members. An even better answer would explain whether a later colony attained membership, or whether a formal procedure was ever defined. Commented Jun 24, 2019 at 18:10
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    What does full membership actually mean in terms of rights and responsibilities?
    – Adwaenyth
    Commented Jun 25, 2019 at 8:49

3 Answers 3


According to the Star Trek: Star Charts factbook, there are several colony worlds that are full members of the Federation including Deneb V, Rigel X and Cestus III.

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We should also mention that there are numerous Earth colonies that are also founding or full members including Earth's Moon, Mars, Terra Nova and Izar.

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The planetary list includes several worlds explicitly named as colonies, including Worf's (adopted) home planet of Gault which he states is a "farming colony" on several occasions.

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  • From the above excerpt, it's not clear to me that Deneb V is supposed to be a colony world. Memory Alpha mentions nothing about it. Commented Jun 25, 2019 at 6:25
  • @O.R.Mapper - I'll wait for you to finish reading the picture above :-)
    – Valorum
    Commented Jun 25, 2019 at 6:27
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    I have read the picture, It says the people on Deneb V colonized Deneb II. However, that doesn't mean that Deneb V was a colony, or that Deneb II is considered a member.
    – trlkly
    Commented Jun 25, 2019 at 6:33
  • @trlkly - The same book notes that all of the inhabited planets of the Deneb system (aside from Deneb IV) are members of the UFP
    – Valorum
    Commented Jun 25, 2019 at 6:55
  • @Valorum: Maybe, but is each planet a member world in its own right? Or are they members (in the sense of "belong to"/"governed by") the UFP because the civilizations that colonized them happen to be UFP members? Commented Jun 25, 2019 at 7:32

According to the Last Unicorn Game RPG sourcebook on the Federation The Price of Freedom, colonies are not members of the UFP. The relevant chapter is on page 42 of the book.

Colonies established by a specific species or government are represented through their homeworld's delegation:

The UFP sees the colonies of a specific homeworld as an extension of that planet's population and government.

There is also, apparently, a fear from some that giving membership and representation to colonies would unbalance the UFP to favour the species with the most colonies.

Some established colonies want to send their own delegations to the Federation Council and be recognized as full member worlds. However, some species without many planetary colonies fear this will unbalance the UFP in favor of more populous or widespread species, shutting them out of government.

Finally, in Star Trek: First Contact, Picard tells Lily Sloane that there is over 150 member planets spread over 8000 light-years. That seems a small number to include the colonies given that it is hinted throughout the series that there is a large number of colonies, and new one being founded on a regular basis as the Federation expands through the galaxy.



The Federation does not prevent its citizens from leaving Federation space. Once they do, they are free to colonize a new world and apply for Federation citizenship.

But sometimes colonists stay within Federation space. Those colonists are already Federation citizens - which may prevent them from becoming a "member world". But they are still Federation citizens.

(I can't find any in-universe proof, but I'm pretty sure the Federation is democratic and treats all citizens the same regardless of their home-world.)

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