Quévy is a municipality of Wallonia located in the province of Hainaut, Belgium. On 1 January 2006, Quévy had a total population of 7,734. …Quévy is a municipality of Wallonia located in the province of Hainaut, Belgium. On 1 January 2006, Quévy had a total population of 7,734. The total area is 65.16 km² which gives a population density of 119 inhabitants per km².