Islandia is an unincorporated community and former city in Miami-Dade County, Florida, United States. It is located in the upper Florida Keys on the islands of Elliott Key and other nearby keys, such as Totten Key. It was the only municipality in the Florida Keys not located in neighboring Monroe County. The population was 18 at the 2010 Census. Most residents of the city were National Park Service employees.
In the 2010 Primary Election, the Miami-Dade County Commission was empowered via a charter amendment to abolish Islandia. On December 6, 2011, Miami-Dade County Commissioners unanimously approved an ordinance to abolish the city, with final action to be taken after a public hearing. Following a public hearing, the ordinance abolishing Islandia received final approval on March 6, 2012, and took effect on March 16, 2012.