Kalamazoo Country Day School was incorporated as a nonprofit independent school in 1979 by a group of families which had been affiliated with Barbour Hall, a Catholic boys' school operated by the Sisters of St. Joseph. When the Sisters announced the closing of their school, this group of families immediately began the necessary steps to establish a new school. The new school, no longer Catholic, military, nor a boys' school, opened its doors in September 1979, in a leased school building in Comstock, Michigan. When the population grew to 140 students, the facilities were moved to the present location. The school building was leased for a period of seven years with an option to buy at the end of the lease. The purchase took place in 1990. The major operating expenses are funded by tuition, with a small budgeted amount generated through fund raising.

The Tutorial Program was added in 1985. The Preschool, Beforecare and Aftercare programs were fully implemented by the fall of 1990. Summer programs, operated by the Preschool faculty, were included that same year.

Kalamazoo Country Day School currently serves approximately 220 students in Preschool through Eighth Grade with 20 full-time instructors, 7 part time instructors. The school is governed by a Board of Trustees, and administered by a director, an administrative assistant, and a bookkeeper.