As a voluntary, membership-driven organization, CSD takes pride in providing exemplary, nationally-recognized services in educational technology, cooperative purchasing, staff development, and in serving as a proactive voice for education in the greater St. Louis area. CSD's 61 member school districts are from the City of St. Louis, and St. Louis, St. Charles, Franklin, Gasconade, Jefferson, Lincoln, Warren, and Washington counties in Missouri. The two districts in Illinois that utilize CSD services are from Madison and St. Clair counties. CSD is owned and governed by 29 school districts, at Level I/Owner members. In addition, 35 other public school districts have membership in CSD as Level II or Level III members. The services listed below are included within the various levels of CSD membership: