Waterloo is a municipality in the Belgian province of Walloon Brabant.
On January 1, 2005 Waterloo had a total population of 29,230. The total area is 21.03 km² which gives a population density of 1,390.04 inhabitants per km².
One quarter of the current registered population are non-Belgian, most of whom work for institutions in Brussels, the capital of the European Union.
Waterloo is also home to St. John's International School, one of the larger international schools in Belgium.
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