Jacksonville spans Duval County along Florida's northeastern coast, stretching from the St. Johns River west to the Nassau County line and south toward St. Johns and Clay counties. The city's economy centers on its deep-water port, three naval installations including NAS Jacksonville, healthcare systems like Mayo Clinic and Baptist Health, and financial services operations. Neighborhoods range from Riverside and San Marco near downtown to the Beaches communities of Atlantic Beach and Neptune Beach, with suburban growth extending through Mandarin, Southside, and the Northside corridor along I-95.