Dade County, FL
History
Dade County was created on January 18, 1836 under the Territorial Act of the United States. The county was named after Major Francis L. Dade, a soldier killed in 1835 in the Second Seminole War, at what has since been named the Dade Battlefield. At the time of its creation, Dade County included the land that now contains Palm Beach and Broward counties, together with the Florida Keys from Bahia Honda Key north and the land of present day Miami-Dade County. The county seat was originally at Indian Key in the Florida Keys, then in 1844, the County seat was moved to Miami.http://en.wikipedia.org/wiki/Dade_County,_Florida
Modern Day Adjacent Counties
Broward County, Florida - northMonroe County, Florida - south and west
Collier County, Florida - northwest