Ōta (大田区, Ōta-ku) is a special ward in the Tokyo Metropolis in Japan. The ward refers to itself in English as Ōta City. It was formed in 1947 as a merger of Ōmori and Kamata following Tokyo City's transformation into Tokyo Metropolis. The southernmost of the 23 special wards, Ōta borders the special wards of Shinagawa, Meguro and Setagaya to the north, and Kōtō to the east. Across the Tama River in Kanagawa Prefecture is the city of Kawasaki, forming the boundaries to the south and west.
Ōta is the largest special ward in Tokyo by area, spanning 59.46 square kilometres (22.96 sq mi). As of 2024, the ward has an estimated population of 744,849, making it the third largest special ward by population, with a population density of 12,041 inhabitants per square kilometre (31,190/sq mi).
Notable neighborhoods and districts of Ōta include Kamata, the administrative center of the ward where the Ward Office and central Post Office is located, and Den-en-chōfu(田園調布), known for its wealthy residents and luxury homes. Haneda Airport, the busiest airport in Japan by passenger traffic is located in the ward.
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