Muroran is a city and port located in Iburi Subprefecture, Hokkaido, Japan. It is the capital city of Iburi Subprefecture. As of January 31, 2024, the city had an estimated population of 76,385, with 43,494 households and a population density of 944 people per square kilometre. The total area is 80.88 km2 (31.23 sq mi).