Mercier is a town in southwestern Quebec, Canada in the Regional County Municipality Rousillon. It is located on the Châteauguay River, southwest of Montreal.
According to the Canada 2001 Census:
Population: 9,442
% Change (1996-2001): 4.2
Dwellings: 3,326
Area (sq. km.): 45.95
Density (persons per sq. km.): 205.5
Chapi