Key Biscayne is a village in Miami-Dade County, Florida, United States on the island of Key Biscayne. The population was 10,507 at the 2000 census. As of 2004, the population estimated by the U.S. Census Bureau is 10,324. Key Biscayne is located on the island of Key Biscayne and lies south of Miami Beach and east of Miami. The Village is connected to Miami via the Rickenbacker Causeway, originally built in 1947. Because of its low elevation and direct exposure to the Atlantic Ocean, it is usually among the first Miami areas to be evacuated before an oncoming hurricane.