County Headquarters: Isiolo
Population: 143,294 (2009 Census)
The county is inhabited by the Turkana, Borana, Ameru and Somali with the Boranas forming the largest portion of the population. The inhabitants are mainly Muslim.
The main economic activity is Pastrolism.
The current governor is Mohamed Abdi Kuti (Independent)
Isiolo County Constituencies
The county has 2 constituencies:
- Isiolo North
- Isiolo South