Usuki (臼杵市; -shi) is a city located in Oita, Japan. As of 2003, the city has an estimated population of 35,106 and a density of 231.22 persons per km². The total area is 151.83 km². The city was founded on April 1, 1950. William Adams reached Bungo, now Usuki city, in April 1600. Source: [wikipedia: usuki, oita]