Aarhus is in Denmark.
Aarhus ( [ ˈɒːhuːˀs ] ; officially spelled Århus from 1948 until 31 December 2010 ) is the second-largest city in Denmark and the seat of Aarhus municipality . It is located on the east coast of the Jutland peninsula , in the geographical centre of Denmark , 187 km northwest of Copenhagen and 289 km north of Hamburg , Germany . Being the Danish city with the youngest demographics , with 48,482 inhabitants aged under 18 , Aarhus is also the second fastest growing Danish city , with an average growth of 4,500 people per annum since 2008 . In the 1970s and 1980s , Aarhus became the centre for Denmark 's rock music fostering many iconic bands such as TV-2 and Gnags . The Aarhus ( Aarhus Å ) is a 40 km long river or stream , in eastern Jutland , Denmark .