This paper provides a perspective on the contemporary debate over the production of social housing. Its main focus is on the issue that geographic patterns of service levels may be related to the type of supply program in place. The paper describes the social housing programs in Ontario, Canada over the post-war period. Two main approaches have been taken: public housing, an essentially centralized program; and locally sponsored, third sector housing provided through non-profit corporations and co-operatives. The programs operated in different time periods and the analysis suggests they do have distinctive geographic distributions. The distribution of public housing shows strong correlations with need as defined by the incidence of poor housing conditions and mother-led families. Provision under the localized program is also strongly correlated with the incidence of mother-led families; however, the most consistent associations are with measures of socio-economic status. These results may be partly understood in terms of the changing concept of housing need over the temporal span of the study. Program influences may be that the centralized nature of the public housing program enabled the direction of allocations to high need areas; whereas under the localized program the distribution is more closely related to the social differentiation of leadership roles in service provision under a third sector delivery model. As this approach becomes more prevalent it may be important to examine its potential impacts on service provision.