Rome is the capital city and a special comune of Italy as well as the capital of the Lazio region. The city has been a major human settlement for over two millennia. With 2,860,009 residents in 1,285 km2 (496.1 sq mi), it is also the country's most populated comune. It is the third most populous city in the European Union by population within city limits. It is the centre of the Metropolitan City of Rome, which has a population of 4,355,725 residents, thus making it the most populous metropolitan city in Italy.