The official list is below.
The current 23 wards, with Chiyoda (Kojimachi, Kanda) as a starting point, is
Chuo (Nihonbashi, Kyobashi), Minato (Shiba, Azabu, Akasaka), Shinjuku (Yotsuya, Ushigome, Yodobashi), Bunkyo (Koishikawa, Hongo), Taitou (Shitaya, Asakusa), Sumida (Honjo, Mukojima), and Koto (Fukagawa, Joto)
Shinagawa (Shinagawa, Ebara), Meguro, Oota (Oomori, Kamata), Setagaya, Shibuya, Nakano, Suginami, Teshima, Kita (Takinogawa, Oji), Arakawa, Itabashi, Nerima, Adachi, Katsushika, Edogawa.
【Meguro】 Shonen Ashibe
A comedy manga about a spotted seal baby named Gomachan and his 6 year old friend Ashiya Ashibe.
【Oota】 And Yet the Town Moves
The series follows the exploits of whiny Hotori Arashiyama, her friends, family, neighbors, shopkeepers and colleagues at the local maid cafe. The typical slice of life format is occasionally interspersed with stories dealing with aliens, ghosts and the paranormal.
【Setagaya】 This is covered in a different article.
【Shibuya】 This is covered in a different article.
【Nakano】 Ultimate Girls
During one of the many monster attacks on the city where the story takes place, Silk Koharuno and her two friends attempt to get closer to the monster to get a better view. Unfortunately, the city’s protector, UFO-man, comes to the rescue but inadvertently steps on them and crushes the girls to death. Feeling sorry for what he had done, UFO-man blames their deaths on the monster and promises to bring them back to life by lending them his power. However, now they must become the city’s protectors as well.
A terminally ill girl named Himari Takakura is miraculously saved from death by a strange spirit who resides in a penguin-shaped hat. However, in exchange for extending her life, the spirit tasks Himari’s brothers, Kanba and Shōma, to seek out an elusive item known as the Penguin Drum with assistance from a trio of strange penguins.
Mikado Ryūgamine, a young boy who longs for the exciting life of the big city moves to Ikebukuro to attend Raira Academy with his childhood friend Masaomi Kida, who he has not seen since he was young. After the two meet at the train station, they set out at night to the streets of Ikebukuro. Masaomi warns Mikado about people he doesn’t want to cross in the city, such as the violent and superhumanly strong man Shizuo Heiwajima, the information broker Izaya Orihara, and the mysterious gang known as “The Dollars.” After running into some of the side characters, Mikado sees a local legend called the “Black Rider”, who rides around Ikebukuro on a black bike that occasionally neighs like a horse, and who is rumored to have no head under her helmet. The “Black Rider” is Celty Sturluson, an Irish dullahan who is in Ikebukuro looking for her stolen head. The narrative follows all of the characters equally, showing how their lives intersect and creating a greater plot line from what each character knows about a common incident.