Narashino is a city located in Chiba Prefecture, Japan. As of 30 November 2020, the city had an estimated population of 175,292 in 81,985 hous…Narashino is a city located in Chiba Prefecture, Japan. As of 30 November 2020, the city had an estimated population of 175,292 in 81,985 households and a population density of 8400 persons per km². Narashino is located in far northwestern Chiba Prefecture, bordered by Tokyo Bay to the southwest, and the prefectural capital of Chiba to the east. It is approximately 20 to 30 kilometers from central Tokyo.