Wellin is a municipality located in the Belgian province of Luxembourg. On January 1st, 2004 Wellin had a total population of 2,918 (1,427 males and 1,491 females). The total area is 67.52 km² which gives a population density of 43.22 inhabitants per km². 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. ... Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ...