The city of Key West is the county seat of Monroe County , which consists of a section on the mainland which is almost entirely in Everglades National Park , and the Keys islands from Key Largo to the Dry Tortugas . The city of Key West is the county seat of Monroe County . The county consists of a section on the mainland which is almost entirely in Everglades National Park , and the Keys islands from Key Largo to the Dry Tortugas .