Flagler Beach is a city in Flagler and Volusia counties in the U.S. state of Florida. The population was 4,484 at the 2010 census.Since its incorporation in April 1925, Flagler Beach has developed as a unique seaside community. It is home to six miles of uncrowded beaches, many great fishing spots including the Flagler Beach Municipal Pier, restaurants with oceanfront dining, gift shops and a whole host of recreational facilities.Flagler Beach is part of the Deltona–Daytona Beach–Ormond Beach, FL metropolitan statistical area. It is named for oil tycoon and Florida railroad developer Henry Flagler, who was a key figure in the development of East Florida as resort and vacation destinations.