Yefremovsky District is an administrative district (raion), one of the twenty-three in Tula Oblast, Russia. As a municipal division, it is incorporated as Yefremov Urban Okrug. It is located in the southeast of the oblast. The area of the district is 1,649 square kilometers (637 sq mi). Its administrative center is the town of Yefremov. Population: 64,227 ; 23,436 (2002 Census); 25,057 (1989 Soviet census). The population of Yefremov accounts for 65.9% of the district's total population.