Nakuru County is a county in Kenya. It is located in the Rift Valley, in the southwest of the country, and its capital is Nakuru. Another important locality is Naivasha. The total population of the county is 1 603 325 inhabitants according to the 2009 census. It is the fourth most populous county in the country, after Nairobi, Kakamega and Kiambu. Within the county limits are the Nakuru and Naivasha lakes and the national parks of Nakuru, Naivasha, Hell's Gate and Longonot.