Capital city

A capital city was the city or town that functioned as the seat of government and administrative centre of a country or region.

On Earth
By 2065, Unity City was the capital of Earth's world government. The President of Earth had an office there. (COMIC: Ceasefire — But War Tension Mounts...)

The Americas
Washington was the capital city of the United States of America. (TV: The Return of Doctor Mysterio)

Brasília was the capital city of Brazil. Clyde Langer had erroneously believed it was Rio de Janeiro. (AUDIO: The Thirteenth Stone)

Asia
Karakorum was the capital of the Mongol Empire. By 1289, the capital had moved to the Imperial Palace in Peking, leaving Karakorum abandoned. (TV: Marco Polo)

Europe
London was the capital city of England. (TV: "An Unearthly Child") With a population of 10 million by 2007, it was deemed by Elton Pope to be a "major capital city". (TV: Love & Monsters) Edinburgh was the capital city of Scotland. (PROSE: Moon Blink)

On other planets
Kaalann was the capital city of Skaro. (GAME: City of the Daleks)

Capitol City was the capital city of the human colony planet Tiestus in the 22nd century. (PROSE: Status Update)

The aptly named Capitol was the capital city of Gallifrey. (TV: The Deadly Assassin)

Urbinia's capital city was Kiria, regarded as a seat of great learning across the Third Galaxy. (AUDIO: Daughter of the Gods)