 After the voluntary phase of municipal reform ended, the community of Steinbach was forcibly incorporated into Johannesberg in 1978.Between Johannesberg and Val Orne-Ajon in the French department of Calvados, an official partnership was established in 1990 with quite a number of centres, namely Avenay, Amayé-sur-Orne, Maizet, Montigny, Préaux-Bocage, Maisoncelles-sur-Ajon, Sainte-Honorine-du-Fay and Vacognes-Neuilly.On 18 May 1996, the French community of Trois-Monts joined the group as the ninth community.