Jacksonville is the most populous city in Florida as well as the southeastern United States, and the largest city by area in the contiguous United States. It is the seat of Duval County, with which the city government consolidated in 1968. Consolidation gave Jacksonville its great size and placed most of its metropolitan population within the city limits. As of 2018, Jacksonville's population was estimated to be 903,889. The Jacksonville metropolitan area has a population of 1,523,615 and is the fourth largest metropolitan area in Florida. Jacksonville is centered on the banks of the St. Johns River in the First Coast region of northeast Florida, about 25 miles (40 km) south of the Georgia state line and 328 miles (528 km) north of Miami.[15] The Jacksonville Beaches communities are along the adjacent Atlantic coast. Harbor improvements since the late 19th century have made Jacksonville a major military and civilian deep-water port. Its riverine location facilitates Naval Station Mayport, Naval Air Station Jacksonville, the U.S. Marine Corps Blount Island Command, and the Port of Jacksonville, Florida's third largest seaport. Jacksonville's military bases and the nearby Naval Submarine Base Kings Bay form the third largest military presence in the United States.  Source: Wikipedia