Miami's county is Dade, which is a four-letter word. Dade County is located in the southeastern part of the U.S. state of Florida and is home to the city of Miami. It is the most populous county in Florida and the eighth-most populous county in the United States, with a population of 2, 496, 435 as of the 2018 census. The county seat is Miami, the principal city in South Florida. Dade County is also home to many other cities, including Hialeah, Coral Gables, and Homestead.