Miami is a major coastal city in southeastern Florida, in the United States. Miami is the county seat of Miami-Dade County, the most populous county in Florida. The Miami Urbanized Area (as defined by the Census Bureau) was the fifth most populous urbanized area in the U.S. in the 2000 census with a population of 4,919,036. The United Nations estimated that in 2007, Miami had become the fourth largest urbanized area in the United States, behind New York City, Los Angeles, and Chicago. Miami is well known as a global city because of its importance in finance, commerce, media, entertainment, arts and international trade. The city is home to many company headquarters, banks, and television studios. It is an international center for popular entertainment in television, music, fashion, film, and the performing arts. The city's Port of Miami is known for accommodating the largest volume of cruise ships in the world and is home to many cruise line headquarters. Miami is also home to the largest concentration of international banks in the United States.