Hialeah is a city in Miami-Dade County, Florida, United States. As of 2009, the population estimate by the U. S. Census Bureau had the city's population reduced to 218,896, making it the sixth largest city in the state. Hialeah is part of the Miami metropolitan area and the Greater South Florida metropolitan area. The city's name is most commonly attributed to Muskogee origin, "Haiyakpo" (prairie) and "hili" (pretty) combining in "Hialeah" to mean "pretty prairie". Alternatively, the word is of Seminole origin meaning "Upland Prairie". The city is located upon a large prairie between Biscayne Bay and the Everglades.