School District 3

District 3 (第三学区) is the northernmost district in Academy City. It is bordered by the Saitama Prefecture to the north, District 14 to the east,  District 4 and 16 to the south, and  District 20 to the west.

Its primary focus is for accommodating authorized outsiders, which includes hotels and restaurants.

Principles
It is the school district that has accommodations for its authorized outsiders. There, the district contains a number of international exhibition halls, which promotes state-of-the-art technology from Academy City to its guests. As such, there were always multiple events being held in District 3, such as motor shows, robot shows, and specifically, the Interceptor Show. Technology that the Board of Directors had deemed of an acceptable level to be used outside the city was on display and the outside company that gave the best deal was chosen (Academy City did not "look for" them, they merely "chose"), and that company would pay them vast amounts for that tech.

A direct railroad line leading from District 23 to  District 3, allows foreigners to quickly access the luxurious hotels and facilities of the district that were the highest in all of Academy City.

Celebrities tended to gather in the district, and use ethanol-based fuels for their car to have a distinction between the fuel they put in their cars and the fuel normal people put in theirs.

The district is also well known for its rentable Private Salons, as used by Hamazura Shiage and ITEM.

Document of Constantine Arc
The Interceptor Show occurred on the International Exhibition Hall in District 3, where various technologies were on display, such as the HsPS-15 and the HsAFH-11.

Battle Royale Arc
The Botanical Ethanol Fuel Plant was the site of Mugino Shizuri and Hamazura Shiage's battle and much of its interior was destroyed during the course of the battle.

DRAGON Arc
Following the failure at Hula Hoop, the remnants of Spark Signal moved through the Underground Shopping Center as they headed for a getaway vehicle to escape, and were attacked by GROUP as they did so.

Ten of twenty of the surviving members escaped and took hostages at a Private Salon, including Takitsubo Rikou.

Enemy Item Arc
Several of the events involving Item in July one year before the main story took place in the district. On July 7th, while infiltrating Item itself as a newcomer, "Hanano Choubi" infiltrated an insurance company's headquarters for information on payments relating to the Colosseum, with Item visiting a restaurant in the district for lunch after making their getaway. On July 21st, after Hanano's supposed death, the group intercepted and killed Ibotanokikouji Kaede at the district's bus terminal as she was trying to escape the city. On July 31st, having faked her death, "Hanano Choubi" returned to her secret base in a construction company headquarters in the district and her true position as a dark side executive.