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Key West is an island city in the Straits of Florida, within the U.S. state of Florida. The city lies at the southernmost end of U.S. Route 1, the longest north–south road in the United States. Key West is the southernmost city in the contiguous United States and the westernmost island connected by highway in the Florida Keys. The island is about 4 miles long and 1 mile wide, with a total land area 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 which includes all of the Florida Keys. 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.