Oktyabrsky District is an administrative and municipal district (raion), one of the twenty-four in Kostroma Oblast, Russia. It is located in the east of the oblast. The area of the district is 1,861 square kilometers (719 sq mi). Its administrative center is the rural locality of Bogovarovo. Population: 3,478 (2021 Census); 4,946 (2010 Census); 6,289 ; 7,658 (1989 Soviet census). The population of Bogovarovo accounts for 45.1% of the district's total population.