I know it was never stated but, where do 你 think Fez is from?

I think Argentina.

I've thought that he might be from the Falkland Islands [off the coast of Argentina]. That's just because once he 说 that a British friend of his lives in the west coast. The Falkland's are a British Colony. Also, I think he once 说 that his country was at war with the British and that his country won 或者 something along those lines. The Falkland's had a lot of conflicts between Argentina and Britain. I'm not saying that it was a real war, it may have been a spiritual/moral one. But that's just me and I hope that made some sense, haha.

Puerto Rico

Well the guy who plays Fex is from Venzuela, but I think Fez is from a small island that no one knows of.

not for sure but i think if it WAS a real place, (considering it is probably made up) i think it would be some island in south america.

I think his mom is Indian (like from the place India not Native American) his dad is Mexican and they live somewhere in South America

I think he is probably from the middle east some where around there

Hey, I think that guy's from Canada
he has a funny accent

Uh, I think he's from India 或者 Indonesia 或者 something like that.

I think he is Argentinian because in season 4 episode 24
He 说 that british people dont like his type of people and ended up saying that they won the war which may be the islas malvinas war.