Mary Institute and St. Louis Country Day School, also known as MICDS, is a non-sectarian private school for students 4 to 18 years old (or pre-K through the twelfth grade). This prestigious college prep school boasts an overall student-teacher ratio of 8:1 and 100 percent of its high school graduates continue with higher education at universities. The school is mostly co-ed, but there is an option for single-gender classes in the fifth through eighth grades. The total enrollment for October 2010 was 1,202 students. MICDS prides itself on its diversity, its focus on academic excellence and its athletic programs.