Miyakojima is a city in Okinawa Prefecture, Japan, located on the Miyako Islands. As of 2012, it had a population of 54,908. The current mayor …Miyakojima is a city in Okinawa Prefecture, Japan, located on the Miyako Islands. As of 2012, it had a population of 54,908. The current mayor is Kazuyuki Zakimi, who took office on January 25, 2021. The modern city of Miyakojima was established on October 1, 2005, from the merger of the old city of Hirara, the towns of Gusukube, Irabu and Shimoji, and the village of Ueno. As a result of the merger, Miyako District only has one remaining village.