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Jacksonville is the largest city in the U.S. state of Florida in terms of both population and land area, and the largest city by area in the continental United States. It is the county seat of Duval County, with which the city government consolidated in 1968. The consolidation gave Jacksonville its great size and placed most of its metropolitan population within the city limits; with a population of 821,784, it is the most populous city proper in Florida and the eleventh most populous in the United States. Jacksonville is the principal city in the Greater Jacksonville Metropolitan Area, with a population of 1,313,228.
According to the United States Census Bureau, the city has a total area of 874.3 square miles (2,264 km2), making Jacksonville the largest city in land area in the contiguous United States; of this, 86.66% (757.7 sq mi, 1,962 km2) is land and ; 13.34% (116.7 sq mi, 302 km2) is water.
Jacksonville completely encircles the town of Baldwin. Nassau County lies to the north, Baker County lies to the west, and Clay and St. Johns County lie to the south; the Atlantic Ocean lies to the east, along with the Jacksonville Beaches. The St. Johns River divides the city. The Trout River, a major tributary of the St. Johns River, is located entirely within Jacksonville.