those who have the list, there're 2 ways to identify people of your province or city,
1. roll no.
2. the start of CNIC number.

it's not 100 percent accurate, because like myself, my domicile is balochistan but CNIC of karachi and roll no of islamabad.

you'll get more than 90% candidates. which is good enough..

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Reason has always existed, but not always in a reasonable form - Marx