Mirny is a town and the administrative center of Mirninsky District in the Sakha Republic, Russia, located on the Irelyakh River, 820 kilometer…Mirny is a town and the administrative center of Mirninsky District in the Sakha Republic, Russia, located on the Irelyakh River, 820 kilometers west of Yakutsk, the capital of the republic. As of the 2010 Census, its population was 37,188.