In 1792, Lower Canada is subdivided into counties. Effingham corresponds to the area that will eventualy become the county of Terrebonne, and York includes everything that lies West of Effingham, including Vaudreuil-Soulanges, Deux-Montagnes, Argenteuil, Labelle, the Ottawa valley and Pontiac up to Témiscamingue.
Detail of a map of Lower Canada by Samuel Holland, 1813
(Québec National Library collection)
In 1828, the counties are redefined and get French names.
The counties of Deux-Montagnes and Terrebonne are born.
Deux-Montagnes gets part of the county of York, less the Upper Ottawa valley.
Detail of a map of Lower Canada by Samuel Holland, 1857
(Québec National Library collection)
Toward the end of the 19th Century, the four counties that will form the Laurentians region
get the boundaries tehy will keep for close to a century.
Argenteuil
The County of Argenteuil, in the Electoral Atlas of Canada, 1895
(National Archives of Canada)
Deux-Montagnes
The County of Deux-Montagnes, in the Electoral Atlas of Canada, 1895
(National Archives of Canada)
Labelle
The County of Labelle, in the Electoral Atlas of Canada, 1895
The western half is now part of the Outaouais region.
(National Archives of Canada)
Terrebonne
The County of Terrebonne, in the Electoral Atlas of Canada, 1895
The towns of Terrebonne and Mascouche have since been removed
from the Laurentides region and are now part of Lanaudière.
(National Archives of Canada)
Provincial counties in 2003
The boundaries of the Laurentides region are shown in red.
(Commission de la représentation électorale du Québec)
