Honjō is a city located in Saitama Prefecture, Japan. As of 1 January 2021, the city had an estimated population of 77,900 in 35,026 house…Honjō is a city located in Saitama Prefecture, Japan. As of 1 January 2021, the city had an estimated population of 77,900 in 35,026 households and a population density of 870 persons per km. The total area of the city is 89.69 square kilometres.