The FCT was created in 1948 from the city of Karachi and surrounding areas as the location for Pakistan's capital following its creation.

[2] The FCT was bordered by the province of Sindh to the northeast and the princely state of Las Bela to the northwest with the Arabian Sea to the south.

At that time it had a population of 400,000 people which began to increase rapidly because of the political focus on the city and the fact that it was the major commercial seaport for western Pakistan.

A considerable number of Sindhis and Balochs resided in sporadic villages in this region.The majority spoken language was Sindhi spoken by 52% of population as per 1946 census.However, all of these communities were collectively and simultaneously outnumbered by the inflow of Muslim Muhajir who started settling in Karachi because it was the federal capital as well as the largest commercial hub; and somewhat due to Hindu communities' migration from this region to India, resulting in dramatic and demographic changes in this area.

The territory covered rolling plains bound by hills to the north and west, the river Indus to the east, and the Arabian Sea to the south.