Area code
504
504 is a United States area code. Under the North American Numbering Plan it belongs to Louisiana, which has 6 area codes in total.
Validate a number in 504
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 504 at a glance
NANPA lists 562 central office codes (prefixes) in use in area code 504, held by 38 holders across 6 rate centers.
| Fact | Value |
|---|---|
| In service since | 1947-01-01 |
| Time zone | Central (C) |
| Prefixes in use | 562 |
| Pooled prefixes | 371 (66%) |
| Rate centers | 6 |
| Companies holding prefixes | 38 |
| Assignment dates on file | 2001-01-25 to 2026-03-27 (185 prefixes) |
| ZIP codes in its places | 68 |
Rate centers in area code 504
The largest rate center is NEWORLEANS, with 432 prefixes (77%).
| Rate center | Prefixes | Share |
|---|---|---|
| NEWORLEANS | 432 | 77% |
| KENNER | 100 | 18% |
| LAFITTE | 13 | 2% |
| JESUITBEND | 9 | 2% |
| VENICE | 6 | 1% |
| XXXXXXXXXX | 2 | <1% |
Who holds the prefixes in 504
South Central Bell Tel holds the most prefixes, 219 (39%). 66% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| South Central Bell Tel | 219 | 39% |
| Voicestream GSM I | 81 | 14% |
| New Cingular Wireless PCS | 48 | 9% |
| Verizon Wireless | 38 | 7% |
| Spok | 25 | 4% |
| Onvoy | 23 | 4% |
| 32 other carriers | 128 | 23% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 504
- 1947-01-01 Area code 504 went into service.
- 1998-08-17 Area code 225 went into service and names 504 as its parent.
- 2001-02-12 Area code 985 went into service and names 504 as its parent.
Area codes nearest to 504
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
ZIP codes in area code 504
68 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| New Orleans, LA | 61 |
| Kenner, LA | 5 |
| Lafitte, LA | 1 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 504 numbers
1,955 FCC complaints are on file for 1,541 numbers in 504, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 72 |
| 2024 | 109 |
| 2025 | 187 |
Other area codes in Louisiana
Louisiana is one state with 6 area codes in the NANPA table. 504 is one of them.
Next to 504 in the numbering table
These are the codes just before and after 504 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 504 was first assigned in Louisiana. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Louisiana next to a 504 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 504
Where is area code 504?
NANPA assigns area code 504 to Louisiana, United States.
In which state does area code 504 sit?
Louisiana. 504 is one of 6 area codes the NANPA table assigns to the state.
Which places does area code 504 cover?
The places with the most ZIP codes among the rate centers in 504 are New Orleans, LA, Kenner, LA and Lafitte, LA. The rate center list on this page shows all of them.
Who owns area code 504?
NANPA assigns area codes. Within 504, South Central Bell Tel holds the most prefixes, 219 prefixes or 39%.
Which time zone does 504 use?
The NANPA NPA report lists the time zone for 504 as Central (C).
What year did 504 enter service?
The NANPA NPA report gives an in-service date of 1947-01-01, so 504 has been in use since 1947.
Does area code 504 have an overlay?
The NANPA NPA report lists no other area code in an overlay with 504.
Which area codes are nearest to 504?
The area codes closest to 504, measured between the centers of the ZIP code places they serve, are 985 (about 22 miles), 225 (about 72 miles), 228 (about 82 miles), 601 (about 140 miles) and 769 (about 140 miles).
How many prefixes does area code 504 have?
NANPA's report dated 2026-10-17 lists 562 prefixes in service in 504, spread over 6 rate centers and 38 holders.
Are there complaints about 504 numbers?
The FCC data on file has 1,955 complaints for 1,541 numbers in 504. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.