Seoul proper is noted for its population density, which is almost twice that of New York City and eight times greater than Rome. Its metropolitan area was the most densely populated among OECD countries in Asia in 2012, and second worldwide after that of Paris. As of 2015, the population was 9.86 million, in 2012, it was 10.44 million. As of 2021, the population is 9.59 million.