Muroran is a port city located in the Iburi Subprefecture of Hokkaido, Japan. It serves as the capital city of the subprefecture and is situated within an area of 80.88 square kilometres (31.23 square miles).
As of January 31, 2024, the city had an estimated population of 76,385 residents living in 43,494 households. The population density of Muroran is approximately 944 people per square kilometre.