Area code 504: Louisiana
Area code 504 is a US state area code for Louisiana, on Central Time. It has 562 prefixes in service across 5 rate centers, the largest being New Orleans, Kenner and Lafitte. NANPA lists no overlay code for it. Local calls there take 10 digits.
Local time in area code 504
America/Chicago
Prefixes in service
562 of 792 possible
5 rate centers
Area code 504 facts
| Location | Louisiana, United States |
|---|---|
| Time zone | Central Time |
| Overlays | None |
| In service since | 1947, when the plan began |
| Local calls | 10 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
Which cities and towns use area code 504?
NANPA records each prefix against a rate center, the local billing area a number belongs to, usually named after its main town. These are the 504 rate centers with the most prefixes in service.
| Rate center | Prefixes |
|---|---|
| New Orleans | 432 |
| Kenner | 100 |
| Lafitte | 13 |
| Jesuit Bend | 9 |
| Venice | 6 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 504 number?
NANPA's dialling plan for 504: local calls inside the code take 10 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 504 | 504-555-0147 |
|---|---|
| From another US or Canadian area code | 1-504-555-0147 |
| From outside North America | +1 504 555 0147 |
| E.164, for CRMs and SMS tools | +15045550147 |
When did area code 504 start?
Area code 504 is one of the original codes NANPA lists from 1947. It has no overlay, so every number in its area still starts with it.
Tools for 504 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 504 number tells you where it was issued, not what it is now.
Mobiles, landlines and VoIP lines share area codes, and numbers move between carriers. A live line-type and carrier lookup on every number in your list says which is which, and that decides which calling and texting rules apply. It's in the Email + Phone plan.
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Area code 504 questions
- What state is area code 504?
- Area code 504 is in Louisiana, United States. Its largest rate centers by number of prefixes are New Orleans, Kenner, Lafitte, Jesuit Bend and Venice.
- What time zone is area code 504 in?
- Central Time.
- Does area code 504 have an overlay?
- Not as of NANPA's file dated 10/16/2026. Every number in its area uses 504.
- When did area code 504 start?
- Area code 504 is one of the original codes NANPA lists from 1947.
- Is a 504 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 504 have?
- 562 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
Other area codes in Louisiana
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.