Dzerzhinsk is a city in Nizhny Novgorod Oblast, Russia, located along the Oka River, about 370 kilometers east of Moscow and 35 kilometers w…Dzerzhinsk is a city in Nizhny Novgorod Oblast, Russia, located along the Oka River, about 370 kilometers east of Moscow and 35 kilometers west of Nizhny Novgorod. Population: 240,742 ; 261,334 ; 285,071.