Bucharest is a city of high population density: 8,260/km2 (21,400/sq mi), owing to the fact that most of the population lives in high-density communist era apartment blocks (''blocuri''). However, this also depends on the part of the city: the southern boroughs have a higher density than the northern ones. Of the European Union country capital-cities, only Paris and Athens have a higher population density (see List of European Union cities proper by population density).