The question of the "insertion" in space of public housing into the surrounding urban environment is not new. It has often been examined from the perspective of the social environment, but more rarely from that of the physical environment and the accessibility of public and private services and facilities. To qualify the immediate urban environment around Montreal's public housing buildings in its complexity, we are proposing a methodological approach based on the use of several spatial databases in GIS: (1) the Montreal public housing database, (2) individual census data for the Montreal CMA, (3) a satellite image, (4) a land use map, and (5) location data on a series of public and private services and facilities. Use of these spatial data enables us to identify various combinations of advantages and disadvantages within the urban living environment in which Montreal's public housing buildings have been located, according to three dimensions: the social environment, the physical environment, and the accessibility of services and facilities. Our final results show that only a small proportion of public housing tenants (7%) live in residual spaces, that is, in quite unattractive areas of the city which combine a number of urban disadvantages: a degraded physical environment, a high level of social deprivation, and few or no services and facilities.