Area Code 337 – Louisiana
The phone area code for Louisiana is 337 (international format +1337). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 337
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Louisiana
Geographic Coverage and Jurisdiction
Area code 337 is a geographic North American Numbering Plan (NANP) code serving the southwestern region of Louisiana, United States. It was split from area code 318 in 1999 and covers a diverse area that includes the cities of Lafayette, Lake Charles, and Alexandria (though Alexandria is partially served by 318). The code encompasses several parishes (counties), including Lafayette, Calcasieu, Vermilion, Iberia, Acadia, St. Landry, and Evangeline, among others. This region is known for its cultural heritage, oil and gas industry, and educational institutions such as the University of Louisiana at Lafayette.
Dialing Formats and Procedures
Within the 337 area, local calls require 10-digit dialing (area code + 7-digit subscriber number) as mandated by the FCC for all NANP codes. For example, to call a local number in Lafayette, you would dial 337-555-0123. For international callers, the format is +1 337 555 0123 (or 011 1 337 555 0123 from most countries). When calling from outside the United States, replace the leading '1' with the appropriate international exit code. Calls from other area codes within the US and Canada also require dialing 1 + 337 + the 7-digit number.
Numbering Resources and Overlay
As of 2023, area code 337 is not overlaid with another code, meaning it is the sole area code for its geographic region. However, due to increasing demand for telecommunication services, an overlay code (337) may be introduced in the future, which would require 10-digit dialing for all calls, including local ones. Currently, all numbers within 337 are assigned to wireline, wireless, and VoIP providers, and number portability allows subscribers to retain their numbers when changing carriers.
Caller Instructions
For local callers within the 337 area, simply dial the 10-digit number. For long-distance callers within the US or Canada, dial 1 followed by the area code and number. For international callers, dial your country's exit code, then 1, then 337, then the 7-digit number. Remember that calls to 337 numbers are billed according to your carrier's rates; there are no special charges unless you are calling from outside the US.