Third largest city of Pakistan is Faisalabad
After recent population census, Pakistan Bureau of Statistics (PBS) issued a list of most populace cities in the country. In the list of Top Three most populace cities of Pakistan, Faisalabad holds Third position. This position is based on the metrics of most recent population census of the country. The most recent population census of Pakistan, which was conducted in 2017, revealed that Faisalabad is the third largest city of the country on the basis of population.
The city of Faisalabad is located in Punjab province of Pakistan with a relatively high rate of industrial production than any other such major cities in the country.
Source: Source of above answer is Pakistan Bureau Of Statistics