Herblay is located in Paris city, France at the 48.9899, 2.1699 coordinates. Distance from Herblay to other cities. are listed below, click on the city name to find distance between. Distance from Herblay to Cergy-Pontoise 9 km, to Saint-Quentin-en-Yvelines 27 km, to Boulogne-Billancourt 18 km. The green marker indicates the location of Herblay.