In 1978 the Association of Christian Schools International (ACSI) was founded through a merger of three associations: The National Christian School Education Association, The Ohio Association of Christian Schools, and the Western Association of Christian Schools. Soon after the new association formed, several other Christian school associations joined ACSI.
ACSI was first headquartered in La Habra, California, the former office of the California Association of Christian Schools. As the organization grew, larger office and warehouse facilities were needed. Thus, ACSI moved to its new international headquarters in Colorado Springs, Colorado, in 1994.
Today, ACSI's programs and services assist Christian schools at every grade level, including early education and higher education. ACSI is a 501(c)(3)nonprofit organization governed by a 36-member Executive Board elected by member schools.