Population of Karachi is about 14.9 Million or in other words we can say it is almost Fifteen Million
Pakistan conducted its most recent population census in 2017. The census results revealed the population of Karachi as 14.9 millions. This makes about 7.2 per cent of the total population of the country. With such a huge population the city was declared as the most populace city of Pakistan.
The city of Karachi, which was also the first capital city of Pakistan in her early years after partition of Subcontinent, is located in the province of Sindh on the shore of Indian Ocean.
Source: Source of above answer is Pakistan Bureau Of Statistics