Downtown Miami is an urban residential neighborhood, and the central business district of Miami, Miami-Dade County, and South Florida in the United States. Brickell Avenue and Biscayne Boulevard are the main north-south roads, and Flagler Street is the main east-west road.Locally known as Downtown, the area is a cultural, financial, and commercial center of South Florida, tracing its present-day history back to the 19th century.