Shiraoka is a city located in Saitama Prefecture, Japan. As of 1 February 2021, the city had an estimated population of 52,431 in 21,997 house…Shiraoka is a city located in Saitama Prefecture, Japan. As of 1 February 2021, the city had an estimated population of 52,431 in 21,997 households and a population density of 2100 persons per km. The total area of the city is 24.92 square kilometres.