Ōmura is a city located in Nagasaki Prefecture, Japan. As of September 30, 2022, the city has an estimated population of 98,237 and a popul…Ōmura is a city located in Nagasaki Prefecture, Japan. As of September 30, 2022, the city has an estimated population of 98,237 and a population density of 750 persons per km². Its total area is 126.33 km², and it includes Nagasaki Airport.