Koudougou is a city in Burkina Faso's Boulkiemdé Province. It is located 75 kilometres (47 mi) west of Ouagadougou, the capital of Burkina Faso. With 131,825 inhabitants, as of 2006, it is the third largest city by population in Burkina Faso after Ouagadougou and Bobo Dioulasso and is mainly inhabited by the Gurunsi and Mossi ethnic groups. Koudougou is situated on the only railway line in Burkina Faso and has some small industries, a market, a university and provincial government offices.