From Wikipedia: http://en.wikipedia.org/wiki/Dar_es_Salaam

Dar es Salaam is the largest city in Tanzania. It is also the country's richest city and a regionally important economic centre. Dar es Salaam is an administrative province within Tanzania, and consists of three local government areas or administrative districts: Kinondoni to the north, Ilala in the centre of the region, and Temeke to the south. The Dar es Salaam Region had a population of 2,497,940 as of the official 2002 census. Though Dar es Salaam lost its official status as capital city to Dodoma in 1974 (a move which was not complete until 1996), it remains the centre of the permanent central government bureaucracy and continues to serve as the capital for the surrounding Dar es Salaam Region.