 Mahlberg includes the formerly independent municipality of Orschweier, in which about a third of the total population lives.The town of Mahlberg and the Allmendhöfe homestead belong to the town of Mahlberg in the boundaries of September 30, 1973.The former municipality of Orschweier includes the village of Orschweier south of Mahlberg and the Orschweier train station.