Otaru is a city and port in Shiribeshi Subprefecture, Hokkaido, Japan, northwest of Sapporo. The city faces Ishikari Bay and the Sea of Japan, and has long served as the main port of the bay. With its many historical buildings, Otaru is a popular tourist destination. Because it is a 25-minute drive from Sapporo, it has grown as a commuter town. As of July 31, 2023, the city had an estimated population of 107,432 and a population density of 441 persons per km². The total area is 243.83 km2 (94.14 sq mi). Although it is the largest city in Shiribeshi Subprefecture, the subprefecture's capital is the more centrally located Kutchan.