A series of posts at Pottermore detailed the identification of four previously-unknown wizarding schools in the Harry Potter universe. JK Rowling introduces us to Ilvermorny, Castelobruxo, Uagadou, and Mahoutokoro. The daily Dot has their descriptions, including the one in the United States.
All we have on the American wizarding school is a name and a general sense of where it’s located. Rowling shot down the idea that it was based in New York and said the name was “immigrant in origin.” Based off the marker, Ilvermorny is based somewhere along the East Coast anywhere from Appalachia to the border between the U.S. and Canada. In addition, “Indigenous magic was important in the founding of the school.”
Rowling has said that Newt Scamander will encounter witches and wizards who attended Ilvermorny, although he won’t visit the school itself during his travels in Fantastic Beasts. But some astute fans posited that Ilvermorny was the name of the American school as early as last August.