Nairobi has its boundaries, just the same way Dar has its boundaries. Why you expect Kikuyu to fall within Nairobi boundaries when it isn't only you can tell us. Perhaps you've never been to Nairobi but this city outgrew its boundaries many years ago and that's why there are places that are not geographically in Nairobi but now identify with the city. It has become one big metropolis spreading to as far as Isinya and Ngong in Kajiado County to Mlolongo and Syokimau in Machakos county and Ruiru and Juja in Kiambu County. All these are built up areas, something that you will never find in Dar.
I want to single out Kikuyu for instance. You became selective in your post about this area not knowing that Kikuyu is more than what you portrayed. Yes, this is Kikuyu, and it's not in Nairobi though it forms part of the metropolis
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Bado mko nyuma kama mkia wa kondoo