Key Vaca
| Geography | |
|---|---|
| Location | Gulf of Mexico |
| Coordinates | 24°43′09″N 81°04′08″W / 24.71917°N 81.06889°W |
| Archipelago | Florida Keys |
| Adjacent to | Florida Straits |
| Highest elevation | 7 ft (2.1 m) |
| Administration | |
| State | Florida |
| County | Monroe |
Key Vaca is an island in the middle Florida Keys, located entirely within the borders of the city of Marathon, Florida.