Pervomaysky District (Russian: Первома́йский райо́н) is an administrative and municipal district (raion), one of the twenty-three in Tambov Oblast, Russia. It is located in the northwest of the oblast. The area of the district is 970 square kilometers (370 sq mi).[citation needed] Its administrative center is the urban locality (a work settlement) of Pervomaysky. Population: 29,277 (2010 Census); 31,925 (2002 Census); 35,948 (1989 Census). The population of the administrative center accounts for 43.2% of the district's total population.