Except Maurecourt, which is in the Yvelines department, all communes are part of the Val-d'Oise department.
Population
Historical population
Year
Pop.
±%
1962
34,050
—
1968
41,576
+22.1%
1975
69,546
+67.3%
1982
102,967
+48.1%
1990
159,168
+54.6%
1999
178,656
+12.2%
2003
183,430
+2.7%
Since the establishment of the new agglomeration, the population has quadrupled over forty years.
History
In the 1960s, faced by the fast development of Paris and its suburbs, it was decided to control and balance it by creating several new cities around Paris.
To the north, the choice was made on the surroundings of Pontoise. The old city was to be integrated in a much larger unit, whose center would be Cergy, at the time not more than a village. From 1965, the establishment of the new city was to be done in several stages:
April 16, 1969: creation of the publicly owned "Établissement public d'aménagement" (EPA)
1971: creation of the Syndicat communautaire d'aménagement (SCA).
^"Mentoins légalesArchived October 3, 2011, at the Wayback Machine." Bandai France. Retrieved on 6 July 2011. "21-23 rue du Petit Albi, 95808 CERGY-PONTOISE Cedex."