The Rigel Trade Complex was the capital city of the planet Rigel X. (ST reference: Star Charts)

By the mid-22nd century, the complex consisted of 36 levels which were inhabited by members from various races and cultures. In 2151, crew members from the Earth starship Enterprise visited the complex in search of Klaang, a Klingon agent who had been taken from the Enterprise by the Suliban. (ENT episode & novelization: Broken Bow)

Capital planets and cities
Interstellar states	Paris, Earth (United Federation of Planets) • First City, Qo'noS (Klingon Empire) • Ki Baratan, Romulus (Romulan Star Empire) • Lor'Vela, Andor (Andorian Empire) • Cardassia City, Cardassia (Cardassian Union) • Me'leit, Talar (Talarian Republic) • Rashtag, Janalwa (Holy Order of the Kinshaya) • Ab-Tzenketh (Tzenkethi Coalition) • Ferenginar (Ferengi Alliance) • Keelee-Kee, Tezwa (Tezwa) • Rexlar-D, Dosi (Dosi Confederation) • L'hur (Sikarian Canon) • Dinaal City (Dinaal) • New Founder Homeworld (Dominion) • Unimatrix 01 (Borg Collective) • Achernar Prime (Imperial Romulan State, defunct)
Federation members	San Francisco (United Earth) • ShiKahr (Confederacy of Vulcan) • New Samarkand (Alpha Centauri) • Ares City (Confederated Martian Colonies) • Ashalla (Republic of Bajor) • Leran Manev (Trill) • Stratos (Ardana) • Pike City (Cestus III) • Iaron (Damiano) • New Coridan (People's Republic of Coridan) • Nuvia (Risian Hedony) • Zhelnogra (Tenara) • Laikan (Andorian Empire)
Federation member state subdivisions & colonies	New Burbank (Rigel VI, United Rigel Colonies) • Rigel Trade Complex (Rigel X, United Rigel Colonies) • New Rakantha (New Bajor, Republic of Bajor) • Port Emily (Sherman's Planet) • London (United Kingdom, United Earth) • Washington, DC (United States, United Earth) • Madrid (Spain, United Earth)
Interstellar state subdivisions	Ka'Hat (Sherman's Planet, Klingon Empire) • Kecemen (Karemma Foundation, Dominion)