The National Assembly on School-Based Health Care conducted the 2004-05 Census, the tenth count of school-based health centers (SBHCs) since 1986, to: (1) provide a better understanding of the role of SBHCs in meeting the needs of underserved children and adolescents; (2) collect up-to-date data on demographics, staffing services, operations, prevention activities, clinical policies and trends; and (3) create a national directory of programs. Census 2004-05 identified 1709 school-connected programs nationwide. This number includes school-based, mobile and linked programs. 1335 or 78% of known programs responded to the survey. These data on practices and operations during the 2004-05 school year were collected from October 2005 through October 2006. Efforts were made to confirm that non-respondents were open during the 2004-05 school year. This report describes the 1235 sites providing a minimum of primary care service, defined as having a staffing profile with a nurse practitioner, physician assistant or physician on school grounds. [Additional funding for this paper was provided by the Office of Special Populations.]