Re: Biggest non Pakistani populations in Pakistan...
Some Chinese that run dozens of chinese restaurants,accupunture centers in all the big cities...i am guessing their # must be around 200-500 in Lahore ,same in Islamabad & Karachi(Many of them are there for many years,but travel back to China very often).
Some Iranians mainly in Karachi/Lahore that have been there for many deceades and speak Urdu.
Karachi has some population of African students(mainly Kenya,Nigeria & Somalia) & some Arabs(mainly Yemen,Jordan & Syria).Many African students are caught in drug trafficking every now & then.
Obviously illegal Bengalis numbered around half a million in Karachi (that usually work as domestic servants & came there mainly in mid 80's) & then illegal Afghans that are around 2.5 million(mainly in Karachi,Peshawar,Islamabad & Quetta)came after the Soviet war.
There are some Muslim students in madrassahs from all the islamic world(including south east asia/Indonesia/Malaysia)but their numbers have significantly decreased since when government has put a ban & since US is in Afghanistan.Pakistan used to be a launching pad for them to go into Afghanistan.
There are not much Europeans,since the Talibanization of the area & then the US presence.