South Miami is a city in Miami-Dade County, Florida, United States. The city is part of the Miami metropolitan area of South Florida. The popul…South Miami is a city in Miami-Dade County, Florida, United States. The city is part of the Miami metropolitan area of South Florida. The population was 12,026 as of the 2020 census. South Florida had been roamed by Native Americans, probably for centuries, before white pioneers advanced through Little Hunting Ground to Big Hunting Ground.