Nandi County is in the North Rift of Kenya, occupying an area of 2,884.4 square kilometres. Its capital, Kapsabet, is the largest town in the county while other towns include Mosoriot, Tinderet, Kobujoi, Kaiboi, Kabiyet and Nandi Hills. According to a 2019 census, the county had a population of 885,711, made up of a number of Kenyan communities, the majority of whom belong to the native tribe called Nandi.

Geographically, the unique jug-shaped structure of Nandi County is bound by the Equator to the south and extends northwards to latitude 0034’N. The western boundary extends to west. The county's major area is covered by the Nandi Hills.