North American Numbers Source-cited · ownership disclosed
Area code
904
In service
United States · since 1965

Jacksonville

Serves northeast Florida (the "First Coast"), anchored by the Jacksonville metropolitan area. Now part of an overlay complex with area code 324.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Jacksonville
Type
geographic
Status
in service
In service since
1965
Projected exhaust
2057 Q3

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 904 is

Northeast Florida (First Coast).

Communities served wholly or partly by 904:

Jacksonville

Primary city Jacksonville; also covers St. Augustine, Fernandina Beach and surrounding First Coast communities.

B · Relationships

How it relates to other codes

The codes 904 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Split from · 1965 305 Miami Created in 1965 from statewide area code 305.
Spawned · 1995 352 Gainesville / Ocala 352 split off from 904 in 1995 (north-central FL).
Spawned · 1997 850 Tallahassee / Pensacola 850 (Panhandle) split off from 904 in 1997.
Spawned · 2001 386 Daytona Beach 386 (Daytona area) split off from 904 in 2001.
Overlay · 2024 324 Jacksonville (overlay) All-services overlay covering the same 904 territory; in service Feb 26, 2024.
What's changing. Active overlay complex with 324 since February 26, 2024; ten-digit dialing required.
C · History

How 904 got here

1965
Area code 904 created for northern Florida, split from 305.
Source: Wikipedia: Area codes 904 and 324
1995
North-central Florida (Ocala/Gainesville region) split off as 352.
Source: Wikipedia: Area codes 904 and 324
1997
Florida Panhandle split off as 850.
Source: Wikipedia: Area codes 850 and 448
2001
Daytona Beach area split off as 386.
Source: Wikipedia: Area codes 904 and 324
2024-02-26
Overlay 324 placed in service; ten-digit dialing mandatory.
Source: Wikipedia: Area codes 904 and 324
D · Capacity

How full it is

Prefixes assigned
800
Prefixes available
0
Thousands-blocks assigned
4,440

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 904 with another code →
Sources
Wikipedia ↗
Area codes 904 and 324
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.