Interesting Surveys by PRC
(2009)
http://www.pewglobal.org/2009/08/13/chapter-2-religion-law-and-society/
Most Say They Are Pakistanis First
When asked whether they think of themselves primarily as Pakistani or as a member of their ethnic group, roughly nine-in-ten (89%) say they see themselves first as Pakistani.
Majorities among all four major ethnic groups analyzed say they think of themselves first as Pakistani. Close to all Punjabis (96%) – the nation’s largest group – say they see themselves first as Pakistanis, as do 92% each of those who identify themselves as Pashtuns or Muhajirs.
Sindhis are somewhat more likely than other ethnic groups to identify with their ethnicity. Just over half of Sindhi people (55%) say they see themselves as Pakistani first, while close to three-in-ten (28%) say they first identify as Sindhi; another 16% volunteer that they see themselves as both equally.
In terms of Pakistan’s regions, large majorities in the North West Frontier Province (NWFP) (98%) and Punjab (96%) say they see themselves as Pakistanis first, rather than identify themselves first by their ethnic background. Ethnic identification is slightly more common in Baluchistan and Sindh. In Baluchistan, the southwestern territory with rugged terrain and sparse population, 32% say they identify themselves first by their ethnicity and 58% say they identify themselves first as Pakistanis. In Sindh, with its concentration of Sindhi people, 72% say they think of themselves first as Pakistani rather than by their ethnic background; 13% think of themselves first by their ethnic identification; and 10% volunteer that they think of themselves as both equally.