Sønderborg (Danish pronunciation: [ˈsønɐˌb̥ɒːˀ] - (German: Sonderburg ) is a Danish town of Region of Southern Denmark. It is the main town and the administrative seat of Sønderborg Municipality. The town has a population of 27,434 (1 January 2014), in a municipality of 75,264. BEF44: Population 1.January by urban areas database from Statistics Denmark