North Miami Beach is a city in Miami-Dade County, Florida, United States. The City of North Miami Beach is part of the Miami metropolitan area …North Miami Beach is a city in Miami-Dade County, Florida, United States. The City of North Miami Beach is part of the Miami metropolitan area of South Florida. Originally named "Fulford-by-the-Sea" in 1926, after Captain William H. Fulford of the U.S. Coast Guard, the city was renamed "North Miami Beach" in 1931. The population was 43,676 at the 2020 US census.