Vilyuysk (Russian: Вилю́йск; IPA: [vʲɪˈlʲʉjsk]; Sakha: Бүлүү) is a town and the administrative center of Vilyuysky District of the Sakha Republic, Russia, located about 600 kilometers (370 mi) from Yakutsk on the Vilyuy River (left tributary of the Lena). Population: 10,233 (2010 Census preliminary results); 9,776 (2002 Census); 8,988 (1989 Census).