This floor has the Boy's Lavatory (There is a passage leading from this bathroom to the seventh floor.) and the Study of Ancient Runes Classroom.

On this floor are the Prefects Bathroom, and the Muggle Studies Classroom.

The floor where the Library, the Storage Room where the Mirror of Erised was kept from September to December 1991, and a Bathroom.

Here you can find the Trophy Room and Armour Gallery, The Third Floor Corridor (now used for the Defence Against The Dark Arts Classes), oh let's not forget the Hospital Wing! And and guess what! There's a secret passage way to Hogsmeade here!

Here you can find the Charms Classroom, The Girl's Lavatory (which is out of order, I might add), and the Defense Against The Dark Arts Professor's Office!

Here you can find the History of Magic Classroom, The Temporary Defense Against The Dark Arts Classroom, oh and I almost forgot! The Gryffindor Head's Office!

Here you can find Classroom Eleven, the Entrance Hall, the Receiving Room, the Great Hall, the Staff Room, and the Caretaker's Office.