Waterloo, Belgium

With a population of just 31,375, Waterloo may seem quaint, but it's a hub for wealthy expats and European institutions. Nearly one-fifth of residents are non-Belgian, many working for the EU in nearby Brussels. However, bureaucracy can be a persistent headache, and the region's mild yet rainy climate is no match for the sunny allure of southern Europe. Still, Waterloo's Argenteuil estate offers top-notch international schools, making it an attractive option for affluent families seeking a Brussels commuter town with a bit more space.