Nairobi County is Kenya's capital and economic hub, contributing approximately 47% of national GDP despite covering just 695 km² — less than 0.1% of Kenya's land area. The county is home to Kenya's financial services sector, the East Africa Community headquarters, major regional corporates, and a rapidly expanding technology and innovation ecosystem.
As a devolved county government, Nairobi manages service delivery for 4.4 million residents across health, water, urban planning, solid waste management, and market services. The county's large own-source revenue base — driven by property rates, business permits, and market fees — gives it greater fiscal autonomy than most counties.