Area Code 904
Florida
Area code 904 serves Florida, primarily Jacksonville, in the Eastern Time (ET) time zone. It has served the region since 11-Jul-1965.
Overlay Area Code
This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.
This area code shares its geographic region with: area code 324 (Jacksonville).
In service since: 11-Jul-1965
Area Code Splits
Parts of this area code’s original geographic region were later assigned new area codes through splits. When a split occurs, some customers in the original area code region are assigned the new area code.
Split into: area code 352 (Gainesville), area code 386 (Deltona), area code 850 (Tallahassee).
Demographics & Economics
- Total Population
- 1,912,633
- Population Density
- 425 people/sq miabove U.S. average (U.S.: 93 people/sq mi)
- Median Household Income
- $68,447near U.S. median (U.S.: $75,144)
- Poverty Rate
- 12.4%near U.S. average (U.S.: 11.5%)
- Unemployment Rate
- 4.3%above U.S. average (U.S.: 3.6%)
- Education Attainment
- Bachelor's Degree+34.3%near U.S. average (U.S.: 33.7%)High School or Lower29.6%
Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.
See how this area code compares to all US area codes in the Statistics dashboard.
Time Zone
- Eastern Time (ET)
NANPA Relief Status
According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.
Source: NANPA NPA Relief Planning Reports · See all relief planning statuses
Current Time
Prefix Utilization
Geographic Coverage
State
FL
Major Cities
- Jacksonville
- Fruit Cove
- Lakeside
- Fleming Island
- Nocatee
- Jacksonville Beach
- Palm Valley
- Yulee
- St. Augustine
- Bellair-Meadowbrook Terrace
- Asbury Lake
- Atlantic Beach
- Fernandina Beach
- Middleburg
- Green Cove Springs
- St. Augustine Shores
- Orange Park
- Macclenny
- Neptune Beach
- St. Augustine Beach
- Starke
- St. Augustine South
- Nassau Village-Ratliff
- Sawgrass
and 14 more cities
Demographics
The estimated population served by area code 904 is approximately 1,912,633. The population density is 425 people per square mile, which is higher than the national average of 93. The median household income is $68,447, which is near the national median of $75,144. Approximately 34.3% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is near the national average. The poverty rate stands at 12.4%, which is near the national rate of 11.5%.
History
Area code 904 was established in 1965 as a geographic area code. Over time, area codes area code 352 and area code 386 were split from 904. It shares its territory with area code area code 324.
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 904).
| County | Population | Share |
|---|---|---|
| Duval, FL | 1,102,911 | 57.7% |
| St. Johns, FL | 338,680 | 17.7% |
| Clay, FL | 234,654 | 12.3% |
| Nassau, FL | 103,602 | 5.4% |
| Putnam, FL | 39,342 | 2.1% |
| Baker, FL | 37,092 | 1.9% |
| Bradford, FL | 25,523 | 1.3% |
| Flagler, FL | 21,368 | 1.1% |
| Union, FL | 7,067 | 0.4% |
| Alachua, FL | 2,394 | 0.1% |
Area Code 904 Family Tree
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All Descendants
Area code 904 was originally assigned in 11-Jul-1965 to serve FL. Over the years, it has generated 5 descendant area codes through a combination of geographic splits and overlays as demand for telephone numbers grew.
Call Context
This area code covers a metropolitan region in FL with moderate to high population density, centered on Jacksonville and surrounding communities.
Nearby Area Codes
Area codes geographically closest to 904.
Other Area Codes in Florida
Area codes that also serve Florida, linked for easy comparison.