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Area code Verified Nov 1, 2026 · Source: NANPA

Area code 504 – Louisiana

504 is one of the original area codes, in service across Louisiana since 1947. 563 of its 786 number blocks are allocated (72%). AT&T is the largest holder with 49.0% of blocks, ahead of T-Mobile at 14.4%. FTC complaints naming a 504 caller ID totalled 403 in the 33 days to 30 October 2026 (247th of 422 ranked codes).

State
Louisiana
In service since
1947
Time zone
Central
Shares area with
No overlay

Who holds 504 number blocks

Share of the 563 assigned NXX blocks (71.6% of the 786 possible), across 40 carriers. This is share of number blocks, not of subscribers.

  • AT&T49%
  • Other CLEC / VoIP19.5%
  • Verizon7.3%
  • Spok4.4%
  • Lumen4.3%
  • Onvoy4.1%
  • Windstream2.8%
  • T-Mobile2.3%
  • Comcast2.3%
  • Bandwidth1.2%
  • Charter1.1%
  • Telnyx0.5%
  • Dish0.5%
  • Vonage0.4%
  • Twilio0.2%

Spam complaints naming 504

FTC Do Not Call complaints where the caller ID was a 504 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.

403 complaints in 33 days
#247 of 422 ranked codes

Rate centers in 504

NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 6.

NEWORLEANS433
KENNER100
LAFITTE13
JESUITBEND9
VENICE6

Timeline

  1. 1947 504 assigned in the original North American Numbering Plan.

More about 504

Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.

All prefixes Every one of the 563 assigned NXX blocks, with the holder of each Local time Zone, UTC offset, clock changes and a live clock Spam complaints How often the code appears in FTC complaints, and what to do Carriers Who holds the number blocks, and why that is not who serves them

Frequently asked about 504

What state is area code 504?

Louisiana.

Is a call from 504 a scam?

Not by itself. 504 drew 403 FTC complaints in the 33 days to 30 October 2026, 247th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.

Which carrier owns 504 numbers?

AT&T holds the largest share of assigned number blocks at 49.0%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.

Do I need to dial 10 digits in 504?

Yes – ten digits for local calls in 504, because it shares its area with another code.

Sources and verification

NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.