When Cergy was selected to become the center of a new city, it was yet only one village. The commune had less 3,000 inhabitants at the end of the 1960s. It then started to develop much more quickly, exceeding 10,000 inhabitants in the mid-1970s and similar the 20,000 in the early-1980s. It is in this decade that its growth was most spectacular, since the city exceeded 48,000 inhabitants in 1990. The increase continued since, but at clearly slowed down intervals, to reach 56,167 according to a complementary census in 2003.
Administration
Cergy is the the préfecture of Val-d'Oise, although Pontoise that is to say is the chief town of the département. Cergy is the chief town of two cantons: *The canton of Cergy-Nord is made of part of Cergy and communes of Boissy-l' Aillerie, Osny, Puiseux-Pontoise (53,779 inhabitants); * The canton of Cergy-Sud is made of part of Cergy and thecommune of Éragny (32,969 inhabitants).
Cergy was built around the last loop made by the river Oise before flowing into the Seine.The city is made of three parts:
Cergy is the main center of the ville nouvelle of Cergy-Pontoise, which includes the municipalities of Pontoise (29,000 inh.), Saint-Ouen-l'Aumône (19,000 inh.), Jouy-le-Moutier (17,000 inh.), Eragny (15,000 inh.), Osny (12,000 inh.), Vauréal (12,000 inh.), Menucourt (5,000 inh.), Courdimanche (4,500 inh.), Neuville-sur-Oise (1,000 inh.), and Puiseux-Pontoise (175 inh.).
On the municipal flag, the blue C (for Cergy) most probably represents the loop of Oise.
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