Oulunsalo is former municipality in the region of Northern Ostrobothnia, in Finland. Along with Haukipudas, Kiiminki and Yli-Ii it lost its municipal status and was merged with the city of Oulu on 1 January 2013. The municipality had a population of 9,746 (31 December 2012) and covered an area of 211.22 square kilometres (81.55 sq mi) of which 127.86 km (49.37 sq mi) is water. The population density is 116.915/km (302.81/sq mi). The municipality was founded in 1882.