North American Numbers Source-cited · ownership disclosed
Area code
337
In service
United States · since 1999

Lafayette

Split from 318 in 1999-2000, area code 337 serves southwestern Louisiana (the Acadiana region), including Lafayette and Lake Charles.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Lafayette
Type
geographic
Status
in service
In service since
1999
Projected exhaust
2053 Q2

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 337 is

Southwestern and south-central Louisiana (Acadiana)..

Communities served wholly or partly by 337:

LafayetteLake CharlesOpelousasNew Iberia

Encompasses numerous Acadiana parishes.

B · Relationships

How it relates to other codes

The codes 337 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?

Split from · 1999 318 Shreveport Split from 318, which had covered Louisiana west of the Mississippi since 1957.
What's changing. Single area code; no overlay reported in the source.
C · History

How 337 got here

1999-10-11
Created as a split from 318; permissive dialing began.
Source: Wikipedia
2000-03-13
Mandatory dialing of 337 began.
Source: Wikipedia
2021-10-24
Transition to mandatory ten-digit dialing (988 rollout).
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
617
Prefixes available
183
Thousands-blocks assigned
2,645

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

Compare 337 with another code →
Sources
Wikipedia ↗
Area code 337
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.