Board Thread:Spoilers!/@comment-24942479-20170422102717/@comment-25375217-20170424030320

I always assumed that Zelena murdered the good witches of East and North. Banishing Glinda was some form of "fate worse than death" as punishment for her "betrayal". Otherwise, they were likely just banished like Glinda was and either have their own pocket dimensions or just wander aimlessly around the Enchanted Forest, unable to return to Oz for some plot or another.

I'm guessing the Wicked Witch of the North was some like-minded person that Zelena put in charge in the Good Witch of the North's place? In the original books, there was a Wicked Witch of both North and South (the former named Mombi, who had a much larger role) who were overthrown sometime by the good witches. Perhaps the reverse happened in the Onceverse.