Tyumentsevsky District is an administrative and municipal district (raion), one of the fifty-nine in Altai Krai, Russia. The area of the district is 2,273 square kilometers (878 sq mi). Its administrative center is the rural locality of Tyumentsevo. Population: 15,695 (2010 census); 17,985 (2002 census); 17,616 (1989 Soviet census). The population of Tyumentsevo accounts for 35.5% of the district's total population.