Izumi is a city located in Osaka Prefecture, Japan. As of 31 December 2021, the city had an estimated population of 184,615 in 80862 hous…Izumi is a city located in Osaka Prefecture, Japan. As of 31 December 2021, the city had an estimated population of 184,615 in 80862 households and a population density of 2200 persons per km². The total area of the city is 84.98 square kilometres.