Nadym is a town in Yamalo-Nenets Autonomous Okrug, Russia, located on the river Nadym. The population has fluctuated over time: 46,611 …Nadym is a town in Yamalo-Nenets Autonomous Okrug, Russia, located on the river Nadym. The population has fluctuated over time: 46,611 ; 45,943 ; 52,586.