Okegawa is a city located in Saitama Prefecture, Japan. As of 1 December 2020, the city had an estimated population of 75,218 in 33,119 house…Okegawa is a city located in Saitama Prefecture, Japan. As of 1 December 2020, the city had an estimated population of 75,218 in 33,119 households and a population density of 3000 persons per km². The total area of the city is 25.35 square kilometres.