Administration

As of 2005^[update], Cergy-Pontoise is a communauté d'agglomération consisting of twelve communes:

Population

Since the establishment of the new agglomeration, the population has quadrupled over forty years.

Demographic evolution of Cergy-Pontoise between 1962 and 2003
1962	1968	1975	1982	1990	1999	2003
34,050	41,576	69,546	102,967	159,168	178,656	183,430

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).
August 11, 1972: official creation of the new city of Cergy-Pontoise, gathering fifteen communes (the eleven current ones, and Boisemont, Boissy-l' Aillerie, Méry-sur-Oise and Pierrelaye).
1983: the law Rocard amended the new cities.
1984: Syndicat d'agglomération nouvelle (SAN) replaces the SCA, four communes left the structure (the four mentioned above)
December 31, 2002: end of the mission and dissolution of the EPA, following the completion of the new city.
January 1, 2004: transformation of the SAN into a communauté d'agglomération.
2004: Boisemont becomes the 12th commune of Cergy-Pontoise.