Port Loko District is a district in the Northern Province of Sierra Leone. It is the most populous District in the North and the fourth most populous District in Sierra Leone. As of 2010, the District has a population of 500,992. Its capital is the town of Port Loko and its largest city is Lunsar. The other major towns in the district include Masiaka, Rokupr, Pepel, Lungi and Gbinti.