The Nairobi City County is the creation of the Constitution of Kenya 2010 and successor of the defunct City Council of Nairobi. It operates under the auspices of the Cities and Urban Areas Act, The Devolved Governments Act and a host of other Acts.

The Nairobi City County is charged with the responsibility of providing a variety of services to residents within its area of jurisdiction. These include the services that were hitherto provided by the defunct City Council and the ones that have been transferred from the national government.

The former include Physical Planning, Public Health, Social Services and Housing, Primary Education Infrastructure, Inspectorate Services, Public Works, Environment Management while the latter include Agriculture, Livestock Development and Fisheries, Trade, Industrialization, Corporate Development, Tourism and Wildlife, Public Service Management.

Vision
To make Nairobi the city of order and dignity; Hope and Opportunities for all.

Mission
To provide affordable, accessible and sustainable quality services, enhancing community participation and creating a secure climate for political, social and economic development through the commitment of a motivated and dedicated team.

Core values
Accountability, transparency, excellence, accessibility, integrity, responsiveness, equity and team work.
The Nairobi City County, in execution of responsibilities and functions bestowed upon it by the above Acts has been divided into three arms as follows:

The Executive led by The Governor
The Legislative Arm or the County Assembly headed by The Speaker
County Public Service Board