Kirinyaga County borders Nyeri County, Murang’a County and Embu County.It covers an area of 1,478.1 square kilometers. The county lies between 1,158 metres and 5,380 metres above sea level in the South and at the Peak of Mt. Kenya respectively. Mt. Kenya which lies on the northern side greatly influences the landscape of the county as well as other topographical features.
The county has a tropical climate and an equatorial rainfall pattern. The climatic condition is influenced by the county position along the equator and its position on the windward side of Mt Kenya. The county has two rainy seasons, the long rains and the short rains. Administratively, the county is divided into five districts namely; Kirinyaga East, Kirinyaga West, Mwea East, Mwea West and Kirinyaga Central. The districts are subdivided further into 12 divisions, 30 locations and 81 sub-locations.The county has four constituencies namely Mwea, Ndia, Kirinyaga Central and Gichugu. Kirinyaga County has twenty (20) wards.