Cowansville, Canada Cowansville is a town in south-central Quebec, Canada, located on Lac Davignon 20km north of the U.S. border. It is the seat of Brome-Missisquoi, a regional county municipality. According to the Canada 2001 Census: - Population: 12,032
- % Change (1996-2001): -0.2
- Dwellings: 5,164
- Area (sq. km.): 46.09
- Density (persons per sq. km.): 261.1
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