Fleurus (French pronunciation: [flœ.ʁys]) is a Walloon municipality located in the Belgian province of Hainaut. On January 1, 2006 Fleurus had a total population of 22,221. The total area is 59.28 km2 (22.89 sq mi) which gives a population density of 375 inhabitants per km². The Postal code is 6220 for most places.