Kelmis is a municipality located in the Belgian province of Liège, named for the historical deposits of calamine nearby. As of 2011, the populatio…Kelmis is a municipality located in the Belgian province of Liège, named for the historical deposits of calamine nearby. As of 2011, the population was 10,881; the area is 18.1 square kilometres, and the population density is 601.2 inhabitants per square kilometre.