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Mosalsky District (Russian: Мосальский райо́н) is an administrative and municipal district (raion), one of the twenty-four in Kaluga Oblast, Russia. It is located in the west of the oblast. The area of the district is 1,320 square kilometers (510 sq mi). Its administrative center is the town of Mosalsk. Population: 9,131 (2021 Census); 9,094 (2010 Census); 10,357 (2002 Census); 11,537 (1989 Soviet census). The population of Mosalsk accounts for 46.4% of the district's total population.