Iwata is a city located in Shizuoka Prefecture, Japan. As of 1 May 2019, the city had an estimated population of 169,897 in 68,215 household…Iwata is a city located in Shizuoka Prefecture, Japan. As of 1 May 2019, the city had an estimated population of 169,897 in 68,215 households and a population density was 1,000 persons per km². The total area of the city was 163.45 square kilometres. Iwata is widely known as the headquarters of the Yamaha Motor Corporation. Iwata is also home to Júbilo Iwata, a J. League soccer team, as well as Yamaha Jubilo, a rugby team.