Isiolo County is a county in the former Eastern Province of Kenya. Its population is 143,294 (2009 census),[1] and its capital is Isiolo. Isiolo County is to be the first county to be developed as part of the Kenya Vision 2030 program. Its capital and largest town is Isiolo.The local topography is arid or semi-arid low plains. Ewaso Nyiro River flows through the county and partly bounds it.