Miami, officially the City of Miami, is a coastal metropolis and the seat of Miami-Dade County in South Florida. With a population of 442,241 as of the 2020 census, it is the second-most populous city in the U.S. state of Florida after Jacksonville. It is the core of the much larger Miami metropolitan area, which, with a population of 6.14 million, is the second-largest metropolitan region in the Southeast and ninth-largest metropolitan region in the United States.