Miami is a city located on the Atlantic coast in southeastern Florida and the county seat of Miami-Dade County. The 42nd largest city proper in the United States, with a population of 419,777, it is the principal, central, and most populous city of the Miami metropolitan area, and the most populous metropolis in the Southeastern United States after Washington, D.C. According to the U.S. Census Bureau, Miami's metro area is the eighth most populous and fourth-largest urban area in the United States, with a population of around 5.5 million.Miami is a major center and a leader in finance, commerce, culture, media, entertainment, the arts, and international trade. In 2012, Miami was classified as an Alpha- World City in the World Cities Study Group’s inventory. In 2010, Miami ranked seventh in the United States in terms of finance, commerce, culture, entertainment, fashion, education, and other sectors. It ranked thirty-third among global cities. In 2008, Forbes magazine ranked Miami "America's Cleanest City", for its year-round good air quality, vast green spaces, clean drinking water, clean streets and city-wide recycling programs. According to a 2009 UBS study of 73 world cities, Miami was ranked as the richest city in the United States, and the world's fifth-richest city in terms of purchasing power. Miami is nicknamed the "Capital of Latin America", is the second largest U.S. city with a Spanish-speaking majority, and the largest city with a Cuban-American plurality.