Key West is an island and city in the Straits of Florida on the North American continent, at the southwesternmost end of the roadway through the Florida Keys in the state of Florida, United States. Key West is the southernmost city in the contiguous United States. The island is about 4 miles long and 1 mile wide, with a total land mass of 4.2 square miles. Duval Street, its main street, is 1.1 miles in length in its 14-block-long crossing from the Gulf of Mexico to the Straits of Florida and the Atlantic Ocean. Key West is about 95 miles north of Cuba at their closest points.
The city is the county seat of Monroe County. The city boundaries include the island of Key West and all or part of several nearby islands: Sigsbee Park, Fleming Key, Sunset Key, and the northern part of Stock Island. The total land area of the city is 5.6 square miles. Key West is the southern terminus of U.S. Route 1, State Road A1A, the East Coast Greenway and, before 1935, the Florida East Coast Railway.
Key West is 129 miles southwest of Miami by air, about 160 miles by car, and 106 miles north-northeast of Havana. Key West is a port of call for many passenger cruise ships.