Hoeilaart is a municipality in the province of Flemish Brabant, in Flanders, one of the three regions of Belgium. The municipality only comprises the town of Hoeilaart proper. On January 1, 2005 Hoeilaart had a total population of 10,094. The total area is 20.43 km² which gives a population density of 494.12 inhabitants per km².
The official language is Dutch (as everywhere in Flanders). Small local minorities consist of nationals from many European union -countries, USA and canada, and from French-speakers that came from Wallonia or Brussels.
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