Oreye is a municipality of Wallonia located in the province of Liège, Belgium. On January 1, 2018, Oreye had a total population of 3,912. …Oreye is a municipality of Wallonia located in the province of Liège, Belgium. On January 1, 2018, Oreye had a total population of 3,912. The total area is 19.64 km² which gives a population density of 199 inhabitants per km².