The Municipal Archives invite you to discover through this retrospective, the evolution of the urban heritage of Oyonnax since 1900 to the present day. Driven by its industry, Oyonnax develops around industrial workshops. This attractiveness triggered a phase of demographic development between 1880 and 1914. This is accompanied by an urbanization marked by the establishment of the railway, new neighborhoods, as well as new industries such as the Grande Vapeur. A second phase of urban growth occurred after 1945. The industrial and demographic pressure was such that the city exploded. New equipment is gradually appearing, such as Valexpo, the Rex or Atmosphere cinemas, or the Aragon Cultural Centre.