As of 2006, the largest cities in the United States, by population, are New York, Los Angeles, Chicago and Houston, followed by Phoenix, Philadelphia and San Antonio. San Diego, Dallas and San Jose finish the list. New York, New York, has been the largest city in the United States for longer than any other city.How many cities are in the US?
While there are 20,000 locations classified as cities in the United States, they vary greatly in size. Ten American cities have a population of over 1 million people (including the three mentioned above), 34 cities have a population of more than 500,000 (including Detroit, Austin, San Francisco and Boston), and many more have smaller populations.