St. Mary of the Mills has the capacity to serve 500 students. There are 2 classes of each grade kindergarten through eighth grade. Class size is limited to 24 students in each kindergarten class and 30 students in each of the respective classes.

St. Mary’s is unique in that its location in Laurel (northern Prince George’s County) makes it convenient to, and therefore able to serve, Prince George’s County but also Howard, Montgomery, and Anne Arundel Counties. We presently have students from all four counties attending with the largest numbers coming from Prince George’s and Howard Counties.