Enghien is a city and municipality of Wallonia located in the province of Hainaut, Belgium. On 1 January 2006, Enghien had a total populatio…Enghien is a city and municipality of Wallonia located in the province of Hainaut, Belgium. On 1 January 2006, Enghien had a total population of 11,980. The total area is 40.59 km², which gives a population density of 295 inhabitants per km².