New York City (US) is 1.29 times as big as Seoul (South Korea)
New York City (NYC), often called simply New York, is the most populous city in the United States. It is located at the southern tip of the U.S. state of New York. New York City is composed of five boroughs, each of which is a county of the State of New York. The five boroughs - Brooklyn, Queens, Manhattan, the Bronx, and Staten Island - were consolidated into a single city in 1898.
Seoul, officially the Seoul Special City, is the capital and largest metropolis of South Korea. Seoul has a population of 9.7 million people, and forms the heart of the Seoul Capital Area with the surrounding Incheon metropolis and Gyeonggi province.