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Kallithea is a district of Athens and a municipality in south Athens regional unit. It is the eighth largest municipality in Greece (96,118 inhabitants, 2021 census) and the fourth biggest in the Athens urban area (following municipalities of Athens, Piraeus and Peristeri). Additionally, it is the 2nd most densely populated municipality in Greece and one of the most densely populated cities in the world, with 20,240/km2 (52,400/sq mi). The municipality has an area of 4.749 km2 (1.834 sq mi).