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Cauchy-à-la-Tour is a commune of France, in the Pas-de-Calais département, canton of Auchel, arrondissement of Béthune. It belongs to the Communauté d'agglomération de l'Artois which gathers 58 communes, and has a population of 200,000 inhabitants.
Population (1999): 2,891 inhabitants.
Marshal Philippe Pétain was born there on April 24, 1856.