Miami-Dade County (commonly called Dade County, Dade, Metro-Dade or Greater Miami) is a county located in the southeastern part of the State of Florida and is the southeasternmost county on the U.S. mainland. According to the 2014 census] the county had a population of 2,662,874, making it the most populous county in Florida and the seventh-most populous county in the United States. It is also Florida's third-largest county in terms of land area, with . The county seat is Miami.