New York City is the only city in the U.S. with more than 8 million residents.New York City is the only city in the U.S. made up of five boroughs.New York City is the only U.S. city with an extensive 24/7 subway system.New York City is the only U.S. city where more people commute by public transit than by driving.New York City is the only U.S. city with over 25,000 licensed yellow taxis.New York City is the only city in the U.S. with two Major League Baseball teams in different leagues (Yankees and Mets).New York City is the only U.S. city that has served as the first capital of the United States and is now home to the United Nations headquarters.New York City is the only U.S. city with more than 800 spoken languages, making it the most linguistically diverse city in the world.New York City is the only U.S. city with 11 professional sports teams across the major leagues (NFL, NBA, MLB, NHL, MLS, WNBA).New York City is the only U.S. city with more than 1 million foreign-born residents.New York City is the only U.S. city where every borough is also a county.New York City is the only U.S. city with more than 60 million annual tourists in a typical pre-pandemic year.New York City is the only U.S. city with a resident population larger than 38 individual states.New York City is the only U.S. city with three major commercial airports serving the metro area (JFK, LaGuardia, and Newark).