I got this information regarding population of kashmiri muslims (Butt, Dar, lone, wain, mir etc. ) in punjab according to 1911 census of punjab their population was around 200, 000 thousand in a total population 23 million of united punjab which consisted of pakistani punjab, indian punjab, himachal pradesh and haryana in those days. If we extrapolate to 2014 and restrict it to only pakistani punjab then the population of kashmiri muslim clans will be around 2 millions and mainly concentrated in the GT cities from Lahore to Rawalpindi.
Thanks! So around about 2 million.