Miami Beach is a coastal resort city in Miami-Dade County, Florida, United States, incorporated on March 26, 1915. The municipality is located on a series of natural and man-made barrier islands between the Atlantic Ocean and Biscayne Bay, the latter which separates the Beach from Miami city proper. The neighborhood of South Beach, comprising the southernmost 2.5 square miles (6.5 km2) of Miami Beach, along with Downtown Miami and the port collectively form the commercial center of South Florida. As of the 2010 census, the city had a total population of 87,779. Miami Beach has been one of America's pre-eminent beach resorts since the early 20th century.