Tromsøya (Northern Sami:Romssasuolu) is a small island in the Tromsøysundet strait between the mainland and Kvaløya island in Tromsømunicipality, Troms county, Norway. It contains the city centre of Tromsø and several residential areas. The 22.8 square kilometres (8.8sqmi) island has a population (2012) of 36,088, which gives the city a population density of 1,583 inhabitants per square kilometre (4,100/sqmi).