The name Pierrefonds-Roxboro was created 1 January 2006 following the demergers . It is a borough of the city of Montreal. It is composed of the former municipalities of Pierrefonds and Roxboro, spanning the northern part of the West Island. Besides its land borders with the borough of L'Île-Bizard–Sainte-Geneviève, as well as the boroughs of Saint-Laurent and Ahuntsic-Cartierville to the east, it borders the municipalities of Senneville, Sainte-Anne-de-Bellevue, Kirkland, and Dollard-des-Ormeaux.