 Dorval and Côte Saint-Luc had the status of city when they were amalgamated into Montreal on January 1, 2002 as part of the municipal reorganization in Quebec; however, when re-constituted as independent municipalities on January 1, 2006, it was with the status of town () (although the municipal government of Dorval still uses the name Cité de Dorval).Prior to January 1, 1995, the code for municipalité was not M but rather SD ("sans désignation"; that is, unqualified municipality).Prior to 2004, there was a single code, TR, to cover the modern-day TC and TK.