MICDS (Mary Institute and Saint Louis Country Day School) is a secular, co-educational, independent school home to more than 1,250 students ranging from grades Junior Kindergarten through 12, including a separate Lower School for children in Junior Kindergarten through Grade 4 known as the Ronald Beasley or "Beasley" School, the MICDS Middle School, spanning grades 5 through 8, and the Upper School, consisting of grades 9 through 12.