Area Code Atlas

NPA 337 split from 318

In 1999, the southern half of area code 318, including Lafayette and Lake Charles, was split off to create area code 337. This reduced the geographic area covered by 318.

NANP-Split of 318 Numbering Plan Area (NPA) in Louisiana; introduction of NPA 337

Area code 337 created from split of 318

On October 11, 1999, area code 337 was created in a split from area code 318. The new code covered southwestern Louisiana, while 318 continued to serve the northern and central regions.

Urgent Reminder: Mandatory Dialing for Wireless Codes in the 337 NPA (Louisiana)

FCC designates 988 as 3-digit code for National Suicide Prevention Lifeline

On July 16, 2020, the FCC adopted an order designating 988 as the nationwide 3-digit dialing code for the National Suicide Prevention Lifeline. This change required area codes, including 337, that used 988 as a central office code and permitted 7-digit dialing to transition to 10-digit dialing.

Permissive 10-digit dialing begins in area code 337

Permissive 10-digit dialing began in area code 337 on April 24, 2021. During this period, both 7-digit and 10-digit dialing were allowed in preparation for the transition to mandatory 10-digit dialing due to the implementation of 988 as a 3-digit code.

Mandatory 10-digit dialing implemented in area code 337

On October 24, 2021, mandatory 10-digit dialing was implemented in area code 337. This change was required to accommodate the nationwide adoption of 988 as a 3-digit code for the National Suicide Prevention Lifeline, resolving conflicts with existing 988 central office codes.