Jacksonville, as well as the southeastern United States, is the most populous city in Florida, and the largest city by population in the contiguous United States. The population of Jacksonville had been estimated to be 903,889. Jacksonville is based on the banks of the St. Johns River in northeastern Florida's First Coast area, approximately 25 miles south of the Georgia state line and 328 miles north of Miami. Jacksonville was named after Andrew Jackson, the first military governor of the Florida Territory and seventh President of the United States.