Saito is a city located in Miyazaki Prefecture, Japan. As of 1 November 2023, the city had an estimated population of 28,538 in 13964 houseā¦Saito is a city located in Miyazaki Prefecture, Japan. As of 1 November 2023, the city had an estimated population of 28,538 in 13964 households, and a population density of 65 persons per km. The total area of the city is 438.79 km.