There are 67 heroes living in this city.
It was later opened as a private residential complex for the rich, complete with pools, restaurants, cafes, and even an underground mall.
Hero Association HQEdit
A-City is home to the headquarters of the Hero Association.
Inside the headquarters, there are apartments for heroes in A-Class and S-Class to live in as an option if they wish. All the apartments are within their own section inside.
The headquarter has at least 66 floors.
Number of Heroes by Class:
- S-Class: 3
- A-Class: 7
- B-Class: 2
- C-Class: 57
Hero Association StaffEdit
- Vaccine Man (deceased)
- Skyfolk (deceased)
Saitama Introduction ArcEdit
Hero Association SagaEdit
Rumored Monster ArcEdit
The council of the Hero Association calls up the heroes to check the status of their cities.
Alien Conquerors Arc Edit
The Hero Association contracts Metal Knight to clear and rebuild A-City, which he does in a week. He focuses on turning the Hero Association headquarters into a nigh-impregnable citadel and leaves most of the surrounding city a wasteland.
Psychic Sisters ArcEdit
Having been remade into a fortress by Metal Knight, some of the A-Class and S-Class move there, including Saitama. Since there is still a lot of vacant property within the citadel, some of it is turned into a private residential complex for the rich looking to stay safe, complete with pools, restaurants, cafes, and even an underground mall. It also has the latest anti-earthquake technology installed. Part of the complex is used by the Hero Association as a prison for Mysterious Beings of up to disaster level Demon. 
Parts of the stronghold are destroyed when Tatsumaki and Fubuki clash in the prison area, releasing all the Demon threat level monster prisoners. These damages are further compounded when Saitama intervenes by jettisoning both himself and Tatsumaki out of the building.
- ↑ One-Punch Man Manga; Chapter 20
- ↑ One-Punch Man Manga; Chapter 36, page 27
- ↑ 3.0 3.1 One-Punch Man Anime; Episode 14
- ↑ One-Punch Man Manga; Chapter 93
- ↑ One-Punch Man Manga; Chapter 32, page 13
- ↑ One-Punch Man Webcomic; Chapter 100
- ↑ One-Punch Man Webcomic; Chapter 102
|Cities||A-City • B-City • C-City • D-City • E-City • F-City • G-City • H-City • I-City • J-City • K-City • L-City • M-City • N-City • O-City • P-City • Q-City • R-City • S-City • T-City • U-City • V-City • W-City • X-City • Y-City • Z-City|
|Locations||Bang's Dojo • Cafe & Restaurant Togus • Final Training Ground • Hero Association Hospital • House of Takoyaki 🐙 • King's Apartment • Monster Association Headquarters • Moon • Mouse Sushi • Ninja Village • Saitama's Apartment • Smelly Lid Prison • Z Police Station • Z-City Ghost Town|