Area codes / Louisiana / 504
The 504 area code
504 is one of the original 1947 area codes in Louisiana, in the Central time zone. Get a local 504 number for your business, shared by everyone who answers it, or bring the 504 number you already have.
504 at a glance
- State
- Louisiana
- Time zone
- Central
- In service since
- 1947
- Overlay
- None: the only code for its area
- Local calls
- Dialed with all ten digits (area code and number)
Get a 504 business number
When you sign up for Onyx Phone, you pick a local number by area code: search 504, narrow it by the next three digits or the last four if you want something memorable, and it's yours on the spot. Which numbers are free changes daily.
The number rings everyone you assign to it, in the browser, on the iPhone and Android apps, and on desk phones, and texts from it are unlimited once US carriers approve your business. Your plan includes one number for each user, and more numbers are $5 a month.
Calling 504 customers
Local calls in 504 are dialed with all ten digits: the area code, then the number. Callers are on Central time, so set your business hours to match if most of your customers are here.
Calls from Onyx Phone show your business number, and once your business is verified, your caller ID name too, so 504 customers see who's calling.
Questions about area code 504
What state is area code 504?
Area code 504 is in Louisiana.
What time zone is area code 504 in?
Area code 504 is in the Central time zone.
Is 504 an overlay area code?
No. Today 504 is the only area code for its part of Louisiana.
Can I get a 504 business number?
Onyx Phone sells US local numbers. When you pick your number, search the 504 area code; which numbers are free changes daily.
Can I keep the 504 number I already have?
Yes. Moving a number to Onyx Phone is free on every plan and usually takes 3 to 7 business days. You answer on a temporary number until it moves.
Included on every plan
Starter is $17, Business is $29, Scale is $42 per user a month, or less billed yearly. The plan includes a business number for each user and unlimited calling and texting in the US and Canada. Every plan starts with a 7-day free trial, and moving your current number over is free.
Area code data from the North American Numbering Plan Administrator (NANPA), file of October 24, 2026.