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The county seat of Duval County, Jacksonville is the largest city in Florida in population and by area size.  There are more than 500 neighborhoods within Jacksonville.  The city is divided into six planning districts, with distinct neighborhoods within each, and borders defined by major roads and rivers throughout the city.

The six main districts are: Urban Core, Greater Arlington, Southeast Jacksonville, Southwest Jacksonville, Northwest Jacksonville and North Jacksonville.

Urban Core includes: Downtown, LaVilla, Springfield, East Jacksonville, Fairfield, Brooklyn and Southbank.

Residents commonly refer to Southeast Jacksonville as Southside, just as Southwest Jacksonville is referred to as Westside, and North and Northwest Jacksonville are also called Northside.  Much of Northwest Jacksonville is rural land and therefore not easily classified within the districts.

Neighborhoods within Jacksonville include: Sandalwood, Baymeadows, Deerwood, Lakewood, Loretto, Mandarin, San Marco, Sunbeam, Argyle, Avondale, Cedar Hills, Confederate Point, Lake Shore, Marietta, Murray Hill, Normandy, Ortega, Paxon, Riverside, Whitehouse, Panama Park, North Shore, and Norwood.