Ōta is the largest special ward in Tokyo by area, spanning 59.46 square kilometres (22.96 sq mi).

In the same year, Allied occupational authorities ordered the expansion of the airport, evicting people from the surroundings on 48 hours' notice.

[18] In 2002 Air Nippon was headquartered on the fifth floor of the Utility Center Building (ユーティリティセンタービル, Yūtiriti Sentā Biru) at Haneda Airport in Ōta.

However, Sega Sammy Holdings announced in April 2017 that it would relocate its head office functions and domestic subsidiaries to Shinagawa-ku by January 2018.

After the relocation to Shinagawa was complete, Sega's previous headquarters in Ōta was later sold in February 2019 and will likely be torn down.

[22] The following public high schools are located in Ōta, operated by the Tokyo Metropolitan Government Board of Education.

Public elementary and junior high schools are operated by Ōta City Board of Education [ja] (大田区教育委員会).

[23] [24] The Deutsche Schule Tokyo was previously located in Ōta before relocating to Yokohama, Kanagawa Prefecture in 1970.