Common Name Pakistan Saudi Arabia Official Name Islamic Republic of Pakistan Kingdom of Saudi Arabia Coat of Arms' Flag Official Languages Urdu & English Arabic Population 209,970,000 (2017)[5] 33,000,000[6] Population Density 244.4/km² (633/sq mi) 15/km² (38.8/sq mi) Capital Islamabad Riyadh Largest City Karachi (14,910,352)[7] Riyadh (7,676,654) Area 881,913 km² (340,509 sq mi) 2,149,690 km² (830,000 sq mi) Politics Government Federal Parliamentary Republic Unitary Islamic absolute monarchy[8] Current Leader Imran Khan King Salman Military Personnel 653,800 227,000 Military Expenditures US$11.4 billion (2018)[9] $69.4 Billion Economy GDP (nominal) $324.73 Billion (2018)[10] $748.003 Billion (2019) GDP (PPP) $1.141 Trillion (2018)[11] $1.845 trillion[12] GDP (nominal) per Capita $1,650 $22,649[13] GDP (PPP) per Capita $5,374 $55,859 Human Development Index 0.562 (Medium) 0.853 (Very High)