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 a village in the Wiltz canton until January 1, 1979, when it was combined with the village of Harlange to create the new commune of Lac de la Haute-Sûre.