Aginsky District is an administrative district (raion) Agin-Buryat Okrug of Zabaykalsky Krai, Russia, one of the thirty-one in the krai. It is located in the south of the krai, and borders with Karymsky District in the north, Mogoytuysky District in the east, Ononsky District in the south, and with Duldurginsky District in the west. The area of the district is 6,300 square kilometers (2,400 sq mi). Its administrative center is the urban locality of Aginskoye. Population: 34,354 (2010 Census); 29,511 ; 32,835 (1989 Soviet census). The population of Aginskoye accounts for 45.4% of the district's total population.