Toyota, formerly known as Koromo, is a city in Aichi Prefecture, Japan. As of 1 October 2019, the city had an estimated population of 426,162 a…Toyota, formerly known as Koromo, is a city in Aichi Prefecture, Japan. As of 1 October 2019, the city had an estimated population of 426,162 and a population density of 464 people per km². The total area was 918.32 square kilometres. It is located about 50 minutes from Nagoya by way of the Meitetsu Toyota Line.