 After the Second World War, the Palatinate ceased to be a Bavarian exclave and was incorporated into Rhineland-Palatinate.In the course of administrative restructuring in that state in 1968, Welchweiler was grouped as an "Ortsgemeinde" into the "Verbandsgemeinde" of Altenglan in 1972.The inhabitants’ voting patterns are distinguished by the tendency always to give the SPD a healthy majority.