Mariinsk (Russian: Марии́нск) is a town in Kemerovo Oblast, Russia, located on the Kiya River (Ob's basin) 180 kilometers (110 mi) northeast of Kemerovo. Population: 40,522 (2010 Census preliminary results); 42,977 (2002 Census); 40,956 (1989 Census); 39,700 (1972).