Usolsky District (Russian: Усо́льский райо́н) is an administrative district (raion) of Perm Krai, Russia; one of the thirty-three in the krai. As a municipal division, it is incorporated as Usolsky Municipal District. It is located in the center of the krai. The area of the district is 4,666 square kilometers (1,802 sq mi). Its administrative center is the town of Usolye. Population: 14,232 (2010 Census); 13,398 (2002 Census); 16,265 (1989 Census). The population of Usolye accounts for 40.0% of the district's total population.