Punjab is a province of Pakistan. With a population of over 127 million, it is the most populous province in Pakistan and second most populous subnational polity in the world. Located in the central-eastern region of the country, it has the largest economy, contributing the most to national GDP, in Pakistan. Lahore is the capital and largest city. Other major cities i…Punjab is a province of Pakistan. With a population of over 127 million, it is the most populous province in Pakistan and second most populous subnational polity in the world. Located in the central-eastern region of the country, it has the largest economy, contributing the most to national GDP, in Pakistan. Lahore is the capital and largest city. Other major cities include Faisalabad, Rawalpindi, Gujranwala and Multan.