Cergy

Cergy (French pronunciation:) is a commune in the French department of Val-d'Oise, to the northwest of Paris. It is located 27.8 km (17.3 mi) from the centre of Paris, in the "new town" of Cergy-Pontoise, created in the 1960s, of which it is the central and most populated commune.

Although neighbouring Pontoise is the official préfecture (capital) of the Val-d'Oisedépartement, the préfecture building and administration, as well as the department council (conseil général), are located inside the commune of Cergy. The sous-préfecture building and administration, on the other hand, are located inside the commune of Pontoise.