Eldoret is a principal town in the Rift Valley region of Kenya and serves as the capital of Uasin Gishu County. The town is colloquially known as 'Sisibo'. As per the 2019 Kenya Population and Housing Census, Eldoret is the fifth most populated urban area in the country after Nairobi, Mombasa, Nakuru and Ruiru. Lying south of the Cherangani Hills, the local elevation varies from about 2100 meters at the airport to more than 2700 meters in nearby areas (7000–9000 feet). The population was 289,380 in the 2009 Census, and it is currently the fastest growing town in Kenya with 475,716 people according to 2019 National Census. Eldoret was on course to be named Kenya's fourth city, but was edged out by Nakuru in 2021.