 Since 1924 the city belonged to the district office of Lahr, which in 1939 became the district of Lahr.In 1935, Mahlberg lost its city rights in the course of the National Socialist central administrative “cleanup”, but was given it back in 1950 after the then Prime Minister of Baden, Leo Wohleb (before Baden-Wuerttemberg was founded).With the dissolution of the district of Lahr, Mahlberg fell to the new Ortenaukreis.