Châtelet is a municipality located in the Belgian province of Hainaut. As of January 1, 2004, Châtelet had a total population of 35,538 (16,977 males and 18,561 females). The total area is 27.03 km² which gives a population density of 1,314.70 inhabitants per km². Châtelet can refer to: The city of Châtelet, Belgium. ... A municipality or general-purpose district (compare with: special-purpose district) is an administrative local area generally composed of a clearly defined territory and commonly referring to a city, town, or village government. ... Hainaut (Dutch: Henegouwen) is the westernmost province of Wallonia. ... January 1 is the first day of the calendar year in both the Julian and Gregorian calendars. ... 2004 is a leap year starting on Thursday of the Gregorian calendar. ... Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ...