504
Area code
Statusin service
Introduced1947-01-01
JurisdictionLA, US
Local dialing10D
Time zoneCentral
Last verified2026-09-17
Utilization 73.6% of assignable prefixes assigned
As of 09/17/2026
0%583 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-01-25, most recent 2026-09-16.
Area codes serve rate-center geographies, not municipal boundaries. “LA” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 225 | 38.6% |
| 02 | VOICESTREAM GSM I, LLC | 81 | 13.9% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC - GA | 48 | 8.2% |
| 04 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA | 38 | 6.5% |
| 05 | SPOK, INC. | 25 | 4.3% |
| 06 | ONVOY, LLC - LA | 23 | 3.9% |
| 07 | LEVEL 3 COMMUNICATIONS, LLC - LA | 17 | 2.9% |
| 08 | PAETEC ITEL, LLC | 16 | 2.7% |
| 09 | METROPCS, INC. | 13 | 2.2% |
| 10 | COMCAST IP PHONE, LLC | 13 | 2.2% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 1998-10-05 Jeopardy Conservation Procedures Announced for Louisiana NPA 504 and Reminder of the Extended Mandatory Date of 8/16/99 for Cellular Service jeopardy
- 1947-01-01Area code 504 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-01-08 | PL-556 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Lifeline) – supersedes PL-544 |
| 2020-08-17 | PL-544 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline |
| 2001-09-11 | PL-301 ↗ | 504/985 Split - Extended Permissive Dialing for Wireless (Louisiana) |
| 2000-10-20 | PL-242 ↗ | 504 NPA Split, Creating 985 NPA (Louisiana) |