Established in 1961, Aidan Montessori School is a co-educational day school. The school has more than 200 students and provides admissions from ages 18 months to 12 years. The subjects taught include fine arts, social systems, humanities, science and technology, health and fitness, cooperative and individual recreational arts. The school has two toddler classes, four primary classes, two lower elementary classes and one upper elementary class. The school is accredited by the Association Montessori Internationale and is located in Washington, D.C.