Miyako is a city located in Iwate Prefecture, Japan. As of 1 April 2020, the city had an estimated population of 51,150, and a population density …Miyako is a city located in Iwate Prefecture, Japan. As of 1 April 2020, the city had an estimated population of 51,150, and a population density of 41 persons per km². The total area of the city is 1,259.15 square kilometers.