The entire constituency is located within Nairobi City County and has an area of 72.4 km2 (28.0 sq mi).
[2] Westlands constituency contains some of the high income suburb[3] areas such as Runda, LakeView, Muthaiga, Kitisuru and Highridge.
Slum areas like Kangemi, Githogoro, DeepSea, Mji Wa Huruma, Kaptagat, Kibagare, Maasai and Suswa are also located within the constituency.
[4] The Sub-county shares the same boundaries with what was Westlands Division of Nairobi and constituency prior to 2013.
Some areas that are electorally placed under Dagoretti North Constituency such as: Kilimani, Lavington, Muthangari, Maziwa and Kileleshwa, form part of the sub-county.