Okazaki (岡崎市, Okazaki-shi) is a city located in Aichi Prefecture, Japan.As of June 2014, the city had an estimated population of 375,321 and a population density of 968 persons per km².kazaki is located in the coastal plains of southeastern Aichi Prefecture. The ground rises to undulating hills in the former Nukata area to the northeast. About 60 percent of the city area is forested and remains sparsely populated.