Cergy is a commune in the northwestern suburbs of Paris, France. It is located 27.8 km from the center of Paris, in the new town of Cergy-Pontoise, created in the 1960s, of which it is the central and most populated commune. Although neighboring Pontoise is the official préfecture of the Val-d'Oise département, the préfecture building and administration, as well as the department council , are located inside the commune of Cergy, which is regarded as the de facto capital of Val-d'Oise. The sous-préfecture building and administration, on the other hand, are located inside the commune of Pontoise.
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