As of 2019, which is the most populous city in Pakistan?

Karachi is the capital of the Pakistani province of Sindh. It is the most populous city in Pakistan, and fifth-most-populous city proper in the world. Ranked as a beta-global city, the city is Pakistan's premier industrial and financial centre. It is the cultural, economic, philanthropic, educational, and political hub of the country, and Pakistan's most cosmopolitan city. Situated on the Arabian Sea, Karachi serves as a transport hub, and is home to Pakistan's two largest seaports, the Port of Karachi and Port Bin Qasim, as well as Pakistan's busiest airport, Jinnah International Airport.

Karachi is now Pakistan's premier industrial and financial centre. The city has a formal economy estimated to be worth $113 billion as of 2014 which is the largest in Pakistan. Karachi collects over a third of Pakistan's tax revenue, and generates approximately 20% of Pakistan's GDP. Approximately 30% of Pakistani industrial output is from Karachi, while Karachi's ports handle approximately 95% of Pakistan's foreign trade. Approximately 90% of the multinational corporations operating in Pakistan are headquartered in Karachi. Karachi is considered to be Pakistan's fashion capital, and has hosted the annual Karachi Fashion Week since 2009.