Le Plateau-Mont-Royal, Canada

With a population of 104,000 packed into just 8.1 square kilometers, Le Plateau-Mont-Royal is one of the most densely populated boroughs in Canada. The neighborhood boasts a vibrant arts scene and trendy cafes, but its bohemian charms come with persistent bureaucratic headaches - the borough has undergone extensive road diets and renaturalization projects in recent years that have irked some residents. Despite its reputation as a French enclave, the Plateau is actually a diverse, family-oriented community that may appeal to young professionals and artists, but likely not those seeking a more subdued suburban lifestyle.