- County Seat: Homestead
- Formed from: Dade and Monroe
- The less urbanized southern part of Dade County, plus some of the mainland part of Monroe County, form Biscayne County. The residents of this part of Monroe County currently have to travel through another county and across a hundred miles of the Gulf of Mexico to get to the courthouse at Key West. The rest of mainland Monroe County would be transferred to Collier County.
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