 Indeed, it is likely that after the war the village had to be newly settled.In the 18th century there was noticeable growth in the population.During the time of Napoleonic French rule, from 1801 to 1814, Welchweiler belonged to the "Mairie" (“Mayoralty”) of Horschbach, the Canton of Wolfstein, the Arrondissement of Kaiserslautern and the Department of Mont-Tonnerre (or Donnersberg in German), whose capital was at Mainz.