Madison Country Day School is a nonsectarian, independent day school in Dane County, Wisconsin for grades Pre-K through grade 12. The school has an enrollment of about 500 students. It is accredited by the Independent Schools Association of the Central States (ISACS), and is a member of the National Association of Independent Schools (NAIS). It is an International Baccalaureate (IB) World School that offers the IB Diploma Program (DP) to high school students in grades 11 and 12. As well as the IB Middle Years Program (MYP) to students in grades 5 to10 and IB Primary Years Program (PYP) to students in Pre-k to grade 4. Madison Country Day School is informally known as "MCDS".