Miami-Dade County is a county located in the southeastern part of the U.S. state of Florida. The county had a population of 2,701,767 as of the 2020 census, making it the most populous county in Florida and the seventh-most populous county in the United States. It is Florida's third largest county in terms of land area with 1,946 square miles (5,040 km2). The county seat is Miami, the core of the nation's ninth-largest and world's 65th-largest metropolitan area with a 2020 population of 6.138 million people, exceeding the population of 31 of the nation's 50 states as of 2022.

Miami, officially the City of Miami, is a coastal metropolis in the U.S. state of Florida and the seat of Miami-Dade County in South Florida. It is the core of the much larger Miami metropolitan area, which, with a population of 6.14 million, is the second-largest metropolitan area in the Southeast after Atlanta, and the ninth-largest in the United States. With a population of 442,241 as of the 2020 census, Miami is the second-most populous city in Florida after Jacksonville. Miami has the third-largest skyline in the U.S. with over 300 high-rises, 61 of which exceed 491 ft (150 m).