Aleysky District is an administrative and municipal district (raion), one of the fifty-nine in Altai Krai, Russia. It is located in the center of the krai. The area of the district is 3,400 square kilometers (1,300 sq mi). Its administrative center is the town of Aleysk. Population: 16,800 (2010 Census); 20,474 (2002 Census); 21,510 (1989 Soviet census).