904 Area Code: Jacksonville, Florida

Northeast Florida is served by the 904 area code, with Jacksonville as its primary city. Jacksonville sits along the lower St. Johns River, where the river makes a wide bend toward the Atlantic, and the city's geographic footprint is among the largest of any incorporated city in the country — the consolidated city-county boundary takes in much of Duval County. The working economy reflects a substantial port, several major naval installations, a long-standing role as the financial center of north Florida, and a growing healthcare and logistics sector. The 904 footprint runs south to St. Augustine and west toward the small cities along the Suwannee River basin.

In the directory's records linked to 904 numbers, other Florida cities — Cape Coral, Deltona, Fort Lauderdale, Gainesville, and others — recur frequently. None of those are inside the 904 footprint. The pattern reflects standard public-record dynamics across Florida — porting, prior registration, and address linkages. We currently document 633 distinct prefixes within 904 in detail, a working subset of the prefixes the code actually carries.

Jacksonville's home values come in below the US median, an unusual reading for a coastal city of its size, and household income runs below the national figure but not severely so. The city's median age sits in the mid-thirties (close to the US reading), and population places Jacksonville among the larger cities in Florida by total headcount — particularly given the city's consolidated boundaries, which take in much of the surrounding county.