Since 1986, the Center for Population Options (CPO)/Support Center for School-Based Clinics (SBCs) has conducted an annual survey. Over time the SBC has become a prototype for other adolescent health service models. Perhaps the oldest is the school-linked clinic (SLC), a free-standing adolescent health clinic. Located away from the school campus, the SLC has the capability to serve youth who are not in school as well as youth from more than one school, while emphasizing its linkages with the schools. In order to identify SLCs, and in response to the suggestion that the SBCs in some states were underrepresented on the previous year's list, a survey of state departments of health was conducted. The SBC/SLC survey was then sent to 239 clinics, including 224 SBCs and 15 SLCs in February 1991. Results were analyzed for the following categories: schools served, sponsorship and funding, community involvement, clinic operations, clinic use, and staffing patterns. The results indicated that both SBCs and SLCs provided services to a wide range of grade levels and that nearly a quarter of SBCs provided services to students from more than one school. Results from the survey also indicated SLCs seem to have fewer restrictions compared to SBCs with regard to provision of services. (A special section is included on Michigan's teenage health centers.) (LLL)