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Houdain is the county town of a canton in the département of Pas-de-Calais, district of Béthune, in the north of France. It belongs to agglomeration of the Artois which gathers 58 communes, and has a population of 200 000 inhabitants.
Its postal code is 62150
Population (1999): 7,832 inhabitants for the commune and 20,168 inhabitants for the canton.