Senneville is a village on the western tip of the Island of Montreal. It was merged into the city of Montreal on January 1, 2002. On June 20, 2004 it voted to return to being an independent municipality. The demerger took place on January 1, 2006. It is the wealthiest town on the West Island, closely followed by Dollard-Des-Ormeaux and Baie D'Urfé.
The loamy slopes overlooking Lac des Deux Montagnes are excellent for fruit trees and tender plants due to fertile soils, good drainage, and the moderating effect on microclimate provided by the lake.
In the village the population was spread out with 16.0% under the age of 15, 12.9% from 15 to 24, 39.7% from 25 to 44, 34.5% from 45 to 64, and 15.5% who were 65 years of age or older. The median age was 45 years. For every 100 females there were 100.0 males. For every 100 females age 15 and over, there were 103.7 males.
There were 360 households out of which 34.7% had children living with them, 70.8% were married couples living together, 0.0% had a female lone-parent as a householder, and 18.1% of all households were made up of individuals. The average married-couple family size was 3.0.
Christians made up 84.0% of the population, or 66.5% Catholic, 16.5% Protestant, 1.0% Orthodox Christian, and 0.0% other Christian. Other religions in the village include 0.0% Muslim, 3.6% Jewish, 2.1% Eastern religions, and 0.0% other religions. 9.8% of the population claimed to have no religious affiliation.
The median income for a household in the village was $95,347, and the median income for a family was $104,199. Males had an average income of $84,467 versus $47,349 for females. About 1.8% of the labour force was unemployed. The largest occupation categories were 31.8% employed in management occupations, 16.4% sales and service occupations, and 12.7% in social science, education, government service and religion occupations.