Tri-County Christian School is an independent, interdenominational ministry of the Tri-County Christian School Association. The Association was formed in 1981 to establish a Christian school that would make quality Christian education available to the evangelical Christian community in the Freeport area. A nine-member school board, elected from the membership of the Association, governs the Association.

TCCS is blessed to meet in thier 18,000 square foot facility at 2900 West Loras Drive in Freeport, Illinois. During any given school year, the members of TCCS's Board of Directors represent a broad spectrum of churches such as the Assemblies of God, Baptist, Christian Reformed, Evangelical Free, Free Methodist, Mennonite, Nazarene, Reformed, etc. Members of TCCS's staff and student body attend over 25 different churches.

Membership in the Association is open to all families who enroll their children in Tri-County Christian School and who are in agreement with the school’s Statement of Faith. Membership is also open to the general evangelical Christian community so long as the prospective member is at least eighteen years of age, is in agreement with the Statement of Faith, and makes an annual gift to the school of at least $25.00. The Board of Directors must approve all membership applications. The Association meets at least twice per year, in January and May, to elect members to the Board and to approve major policy or financial decisions.