There are several ethnic groups in Qasba Colony including Muhajirs, Pakhtuns, Sindhis and Punjabis. Over 99% of the population is Muslim. Where 50% of population consists of Urdu Speakers while 40% Pukhstons and 10% other ethnic groups. The population of Qasba Colony is estimated to be nearly 90,000. Total area of this Union council is 5.37 square kilometres.
It is a well-developed colony established by Saudi Government in 1965. There are two colleges in this locality one is Degree Science & Commerce College for men and other is Degree Science & Commerce College for girls.
There are several parks in the colony with one flood lights decorated football ground. There is an Interlink between North Nazimabad & Qasba Colony constructed by the National Highway Authority (NHA), innugurated by Governor Sindh Dr. Ishrat ul Ibad Khan along with City Nazim Syed Mustafa Kamal on 15 October 2009, after that Orangi Town, Qasba Colony and Other SITE Town's union councils using this way to travel easily from these towns to North Nazimabad & North Karachi.