Islamabad-Rawalpindi metropolitan area the larger metropolitan area. It uses dedicated bus lanes for all of its route covering 24 bus stations. As Pakistan's capital city, Islamabad serves as the seat of the federal government and is the country's political center. Rawalpindi has remained important historically, as it hosts the headquarters of Pakistan's army. Rawalpindi also temporarily served as the federal capital when Islamabad was being built in the 1960s, to replace Karachi as the capital. Islamabad-Rawalpindi metropolitan area The Islamabad-Rawalpindi metropolitan area is Pakistan's third most populous metropolitan area. It consists principally of the twin cities of Islamabad and Rawalpindi, along with smaller
Sectors of Islamabad all planned and constructed sectors. Sectors of Islamabad Sectors of Islamabad are administrative divisions of Zone I and Zone II of the Islamabad Capital Territory region. The capital territory is divided into 5 zones, of which Zone I and Zone II have been designated urban development zones. Each square shaped sector is named by combining Latin letters and numerals together. The sector letters increase north to south from A through O, while sector number increases east to west from 1 through 20. However, at present time, sectors A thru I and 5 thru 18 are currently open for urban development.