JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Clark University is collaborating with JSTOR to digitize, preserve and extend access to Economic Geography.The demand for mental health care is not easily estimated. A surrogate measure, utilization, is viewed as a function of three groups of characteristics, relating to the service itself, the client group, and location. The influence of location upon utilization is complex. Empirical evidence from Lancaster County, Pennsylvania, supports the notion that the location variable can be decomposed into four elements: physical distance, location as catchment, social distance, and relative location. The relative importance of location is placed in proper perspective by reviewing briefly the role of client and service characteristics on mental health service utilization.Geographers have recently begun to pay increasing attention to the spatial aspects of mental health care. As might be expected in a relatively new field, most of these first research efforts remain relatively uncoordinated. However, four particular themes seem to be gaining prominence in the literature. These are:(1) descriptions of the geographical incidence of mental illness, and of its socioeconomic correlates [7; 14; 23];(2) studies in the utilization and accessibility of health service systems [7; 12; 18; 23; 36; 38]; (3) follow-up studies of the aftercare problems of patients released from mental hospitals [37; 43; 44; 47]; and, (4) analyses of neighborhood opposition to the location of communitybased mental health facilities [8; 9; 37; 47].The purpose of this paper is to provide a systematic basis for understanding the locational dimensions of the demand for mental health care. As such, it might be viewed as part of the research effort devoted toward the second research theme described above. The first section of the paper briefly outlines the theoretical basis of demand for mental health care. Then, in its major central section, the paper examines empirical evidence for the influence of location on demand. Finally, the non-geographical factors influencing demand are reviewed, in order to obtain a proper perspective on the demand problem.