This article proposes to analyse the Québec Health Survey — carried out in 1987 — by using a geographic grid that covers each homogenous area (or social area). First, the grid is elaborated in terms of homogenous areas followed by a description of the geo-socio-economic characteristics of each area, which, in the end, allows for assessing the heath situation in homogenous areas. This analysis brings to light major discrepancies between homogenous areas in such sectors as heath status determinants (alcohol and tobacco consumption, physical activity and social or community support), the actual state of heath (various pathologies) and the consequences that may be attributed to the state of heath (incapacity, recourse to services, medication...). The analysis focuses on Quebec's most vulnerable populations : the low-income residents of the old inner cities and of certain border areas of agglomerations and cities, as well as their counterparts in the regional capitals and in Metropolitan Montréal. Disadvantaged inhabitants of the hinterland and of certain small towns on the periphery are also considered in the analysis.