On maps, diagrams and signboards, the line is shown using the color green, and its stations are given numbers using the letter "C".

The 24.0 km (14.91 mi) line serves the wards of Adachi, Arakawa, Bunkyō, Chiyoda, Minato and Shibuya, and a short stretch of tunnel in Taitō with no station.

The rest run to the southwest beyond Yoyogi-Uehara onto the Odakyu Odawara Line to Isehara.

Metro Morning Way and Metro Homeway and are fully reserved seat commuter trains operating between Hon Atsugi on the Odakyu Odawara Line and Kita-Senju on the Chiyoda Line using 60000 series MSE Romancecar trains.

These services require a seat reservation as well as payment of the Limited Express fee.

[9] As of 1 January 2019[update], the following train types are used on the line, all running as ten-car formations unless otherwise indicated.

On May 15, 2006, women-only cars were introduced on early-morning trains from Toride on the Joban Line to Yoyogi-Uehara.

^ Crowding levels defined by the Ministry of Land, Infrastructure, Transport and Tourism:[18][19]