Lusaka is the capital and largest city of Zambia. It is one of the fastest developing cities in southern Africa. As of 2010, the city’s population was about 1.7 million, while the urban population is estimated at 2.5 million in 2018. Lusaka is the centre of both commerce and government in Zambia and connects to the country’s four main highways heading north, south, east and west. English is the official language of the city administration.