Key West is a city and an island of the same name near the southernmost tip of the Florida Keys in Monroe County, Florida, United States. The city encompasses the namesake island, the part of Stock Island north of US-1 (the Overseas Highway) (east), Sigsbee Park (north, originally known as Dredgers Key), Fleming Key (north), and Sunset Key (west, originally known as Tank Island). Nearby Key Haven (northeast), the part of Stock Island south of US-1 (east) and Wisteria Island, better known as Christmas Tree Island (northwest), are in unincorporated Monroe County. Both Fleming Key and Sigsbee Park are part of the NAS Key West and are inaccessible by civilians. Key West is the county seat of Monroe County. Key West is known as the Southernmost City in the Continental United States. It is also the southern terminus of U.S. Route 1, State Road A1A and the East Coast Greenway. Key West is a seaport destination for many passenger cruise ships. The Key West International Airport provides airline service. Hotels and guest houses are available for lodging. Many restaurants offer a choice of indoor or outdoor dining. Naval Air Station Key West is an important year round training site for Naval Aviation due to the superb weather conditions, which is also a reason the site was chosen as the Winter White House of Harry S. Truman. The central business district primarily comprises Duval Street, and includes much of the northwest corner of the island along Whitehead, Simonton, Front, Greene, Caroline, Eaton Streets and Truman Avenue. The official town motto is "One Human Family."