Vachsky District is an administrative district (raion), one of the forty in Nizhny Novgorod Oblast, Russia. Municipally, it is incorporated as Vachsky Municipal District. It is located in the southwest of the oblast. The area of the district is 979.5 square kilometers (378.2 sq mi). Its administrative center is the urban locality of Vacha. Population: 19,979 ; 23,349 (2002 census); 29,198 (1989 Soviet census). The population of Vacha accounts for 30.0% of the district's total population.