Kisumu is a port city in western Kenya at 1,131 m (3,711 ft), with a population of 394,684 (2009 census). It is the third largest city in Kenya, the principal city of western Kenya, the immediate former capital of Nyanza Province and the headquarters of Kisumu County. It has a municipal charter but no city charter. It is the largest city in Nyanza region and second most important city after Kampala in the greater Lake Victoria basin.
The port was founded in 1901 as the main inland terminal of the Uganda Railway and named Port Florence. Although trade stagnated in the 1980s and 1990s, it is again growing around oil exports.
Kisumu literally means a place of barter trade "sumo". The city has "Friendship" status with Cheltenham, UK and "sister city" status with Roanoke, Virginia and Boulder, Colorado, USA