Cergy is a commune located in the French department of Val-d'Oise, situated to the northwest of Paris. It is positioned approximately 27.8 km (17.3 mi) from the center of the capital city.
The commune serves as the central and most populated area of Cergy-Pontoise, a "new town" established in the 1960s. As a primary component of this urban development, it functions as a significant residential and administrative hub within the region.