The entire constituency is located within Nairobi City County.
It has an area of 152.60 km2 (58.9 sq mi), making it the second-largest constituency in Nairobi after Lang'ata.
[1][2] Regions such as Kamulu, Njiru and Ruai, were hived off from the now defunct Embakasi Constituency and combined to the remaining part of Kasarani Constituency.
The whole of Roysambu, Ruaraka, and part of Embakasi North constituencies are within the Kasarani sub-county.
The Sub-county is headquartered in Kasarani, and headed by the Deputy County Commissioner, working under the Ministry of Interior.