The contributions of the social economy, general cooperation and specific co-operation among co-operatives have been significant aspects of the development on the islands of Lamèque-Miscou since 1930 and 1940. This study presents the importance of co-operation among fisheries, consumers and financial services co-operatives in developing other collective enterprises or associations. This research has collected information through Annual Reports, semi-directed interviews and focus groups. We show that the mobilization of co-operatives in partnership with municipalities and governmental agencies has provided monetary and human investments in a wide spectrum of sectors: housing, arts and culture, leisure, renewable energy and environment protection initiatives. This accomplishment demonstrates the resilience of social economy, co-operatives and social enterprises and their remarkable contribution to territorial development.