We upgrade CCCFSM (2001)’s model on the development of French health services for French-speaking and Acadian communities in a minority situation (FACMS) using evidence-based data from the Canadian 2006 census. Our approach consists in using a statistical procedure to choose a francophone critical mass index that illustrates a coherent supply and demand pattern on a geographical and jurisdictional basis. Supply and demand are greater where FACMS linguistic vitality is greater. Overall, supply falls short of demand; this suggests latent demand for services in French, a result which is consistent with studies on “active offer of French services” in FACMS. Our results are also consistent with the three evolutionary phases proposed by CCCFSM (2001), i.e., “awareness”, “development” and “consolidation”. We discuss methodological limitations and “lessons learned” for FACMS health networks.