St. Margaret's School has three dormitories. Each dorm houses members of every class level and two or more faculty members who serve as dorm parents. All of the dorms are equipped with a kitchen, lounge area with a television, group study spaces, and laundry facilities.
McCuan Hall is the newest dorm and offers suite style living. Two girls share a room and four girls share each bathroom.
Anderton House, or better known as "A House", and Latane Hall each feature water front views and traditional dorm layouts. These dorms are equipped with single and double rooms and girls share hall style bathrooms.