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 and covered an area of 211.22 square kilometres (81.55 sq mi), of which 127.86 km2 (49.37 sq mi) is water. The population density is 116.915/km2 (302.81/sq mi). The municipality was founded in 1882.