Dolinsky District is an administrative district (raion) of Sakhalin Oblast, Russia; one of the seventeen in the oblast. Municipally, it is incorporated as Dolinsky Urban Okrug. It is located in the southeast of the oblast. The area of the district is 2,441.6 square kilometers (942.7 sq mi). Its administrative center is the town of Dolinsk. Population : 13,699 (2010 Census); 15,649 (2002 Census); 22,484 (1989 Soviet census).