Saint-Etienne's 2025 population is now estimated at 381,552. In 1950, the population of Saint-Etienne was 352,055. Saint-Etienne has grown by 1,870 in the last year, which represents a 0.49% annual change.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Saint-Etienne, which typically includes Saint-Etienne's population in addition to adjacent suburban areas.