From the Wikipedia page 
Ilala District is a district in Dar es Salaam, Tanzania, the others being Temeke to the South and Kinondoni to the North. The 2002 National Tanzania Census states the population for Ilala as 634,924. The area is 273 km2 (105 sq mi). Ilala is commonly referred to as 'Downtown Dar', where much of the commerce, banking, and national offices are located.