Trappes is located in Paris city, France at the 48.7741, 2.0178 coordinates. Distance from Trappes to other cities. are listed below, click on the city name to find distance between. Distance from Trappes to Cergy-Pontoise 30 km, to Saint-Quentin-en-Yvelines 0 km, to Boulogne-Billancourt 18 km. The green marker indicates the location of Trappes.