North American Numbers Source-cited · ownership disclosed
Area code
457
In service
United States · since 2025

Northern Louisiana (overlay of 318)

Area code 457 is an all-services overlay of the 318 numbering plan area covering northern and central Louisiana; it entered service on September 25, 2025 and is Louisiana's first area-code overlay.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Northern Louisiana (overlay of 318)
Type
geographic
Status
in service
In service since
2025
Projected exhaust
2095 Q3

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 457 is

Same geography as 318: northern and central Louisiana..

Communities served wholly or partly by 457:

ShreveportBossier CityMonroeAlexandriaRuston

Shares the entire 318 footprint; new assignments only.

B · Relationships

How it relates to other codes

The codes 457 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2025 318 Shreveport Overlays the identical geography of area code 318.
What's changing. Active overlay of 318 since Sept 25, 2025. New 2023+ code — re-check NANPA for current assignment status.
C · History

How 457 got here

2023-05-05
Overlay approved by the Louisiana Public Service Commission.
Source: Wikipedia
2025-08-25
Mandatory ten-digit dialing began.
Source: Wikipedia
2025-09-25
First 457 numbers placed in service.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
14
Prefixes available
786

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 457 with another code →
Sources
Wikipedia ↗
Area codes 318 and 457
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.