WEBOfficial website. Inokashira Park in Mitaka. Mitaka (三鷹市, Mitaka-shi) is a city in the western portion of Tokyo Metropolis, Japan. As of 1 March 2021, the city had an estimated population of 190,403, and a population density of 12,000 persons per km 2. [1] The total area of the city was 16.42 square kilometres (6.34 sq mi).