Gennevilliers is a commune in the northwestern suburbs of Paris, in the Hauts-de-Seine department of Île-de-France. It is located 9.1 km (5.7 mi) from the centre of Paris.

Hauts-de-Seine is a department in the Île-de-France region of France. It covers Paris's western inner suburbs. It is bordered by Paris, Seine-Saint-Denis and Val-de-Marne to the east, Val-d'Oise to the north, Yvelines to the west and Essonne to the south. With a population of 1,624,357 and a total area of 176 square kilometres, it has the second highest population density among all departments of France, after Paris. It is the fifth most populous department in France. Its prefecture is Nanterre, but Boulogne-Billancourt, one of its two subprefectures, alongside Antony, has a larger population.