Mecher was a commune in the canton of Wiltz until 1 January 1979, when it was merged with the commune of Harlange to form the new commune of Lac de la Haute-Sûre.
Mecher was once a village within the Wiltz canton until it was integrated into Harlange commune on January 1, 1979, forming the new Lac de la Haute-Sûre commune.