From 1638 to 1826, Hildburghausen was located in the Duchy of Sachsen-Altenburg. It became part of the new State of Thüringen in 1920. Names Hildburghausen, Kr. Hildburghausen, Thüringen Surnames Fran(t)z (Zürich) Historical Rathaus in Hildburghausen (2006). Source: Bernd Hutschenreuther via Wikipedia Commons. 50.427276, 10.729916 Volga Colonies Zürich