There are more than 500 neighborhoods within the area of Jacksonville, Florida, the largest city in the contiguous United States by area. These include Downtown Jacksonville and surrounding neighborhoods. Additionally, greater Jacksonville is traditionally divided into several major sections with amorphous boundaries: Northside, Westside, Southside, and Arlington, as well as the Jacksonville Beaches.

Jacksonville is the most populous city proper in the U.S. state of Florida, located on the Atlantic coast of northeastern Florida. It is the seat of Duval County, with which the City of Jacksonville consolidated in 1968. It is the largest city by area in the contiguous United States as of 2020.