Onahan Elem School
Oriole Park Elem School
Orozco Elem Fine Arts & Sciences
Orr Academy High School
Ortiz De Dominguez Elem School
Otis Elem School
Otoole Elem School
Our Lady Of Grace School
Our Lady Of Guadalupe School
Our Lady Of Tepayac Elementary School
Our Lady Of Tepeyac High School
Our Lady Of The Snows
Our Lady Of Victory
Our Saviour Lutheran School
Overton Elem School
Owen Elem Scholastic Academy
Owens Elem Community Academy
Pacific College of Oriental Medicine-Chicago
Pactt Learning Center
Paderewski Elem Learning Academy