Kajiado County is a county in the former Rift Valley Province of Kenya. As of 2019, Kajiado county spanned an area of 21,292.7 km2, with a recorded population of 1,117,840. The county borders Nairobi and to its south it borders the Tanzanian regions of Arusha and Kilimanjaro. The county capital is Kajiado town but the largest town is Ongata Rongai. Its main tourist attraction is wildlife.