Is the Trill part of the Federation in Deep Space 9?

[BohandiAnsoid]

Trill civilization is one of my favorite civilizations in Star Trek. And there are Trills in Starfleet and Defiant could fly there without any problems. However, are they part of the Federation or just an ally (like Bajor)? Because we know there can be citizens of non - Federation civilizations in Starfleet. So, are they members of the Federation or not?

 

[Tosk]

So, are they members of the Federation or not?

AFAIK, they were never said to be so. But they were never said not to be either.

They were ex-members in the future history of Discovery season 3/4/5. So they did join at some point.

 

[kkt]

Yes, they never said either way about Trill. New Sydney, where Ezri's mom lived, was not a Federation member because they did not recognize Starfleet's authority on their world. But that was an outlying world from the Trill homeworld.