Kyshtym is a town in Chelyabinsk Oblast, Russia, located on the eastern slopes of the Southern Ural Mountains 90 kilometers (56 mi) northwest of Chelyabinsk, near the town of Ozyorsk. Population: 38,942 (2010 Census); 41,929 (2002 Census); 42,852 (1989 Soviet census); 36,000 (1970).