Area code
337
337 is a United States area code. Under the North American Numbering Plan it belongs to Louisiana, which has 6 area codes in total.
Validate a number in 337
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 337 at a glance
NANPA lists 599 central office codes (prefixes) in use in area code 337, held by 49 holders across 75 rate centers.
| Fact | Value |
|---|---|
| In service since | 1999-10-11 |
| Time zone | Central (C) |
| Prefixes in use | 599 |
| Pooled prefixes | 428 (71%) |
| Rate centers | 75 |
| Companies holding prefixes | 49 |
| Assignment dates on file | 2001-01-09 to 2026-03-27 (283 prefixes) |
| ZIP codes in its places | 81 |
Rate centers in area code 337
| Rate center | Prefixes | Share |
|---|---|---|
| LAFAYETTE | 130 | 22% |
| LK CHARLES | 80 | 13% |
| NEW IBERIA | 28 | 5% |
| LEESVILLE | 22 | 4% |
| OPELOUSAS | 21 | 4% |
| ABBEVILLE | 18 | 3% |
| CROWLEY | 15 | 3% |
| SULPHUR | 15 | 3% |
| 67 other rate centers | 270 | 45% |
Who holds the prefixes in 337
South Central Bell Tel holds the most prefixes, 139 (23%). 71% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| South Central Bell Tel | 139 | 23% |
| New Cingular Wireless PCS | 98 | 16% |
| Verizon Wireless | 53 | 9% |
| Paetec Itel | 34 | 6% |
| Brightspeed Of Louisiana | 33 | 6% |
| Onvoy | 28 | 5% |
| 43 other carriers | 214 | 36% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 337
- 1957-01-01 Area code 318, named as the parent of 337 in the NANPA report, was in service.
- 1999-10-11 Area code 337 went into service.
Area codes nearest to 337
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
ZIP codes in area code 337
81 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Lafayette, LA | 12 |
| Lake Charles, LA | 11 |
| New Iberia, LA | 3 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 337 numbers
1,353 FCC complaints are on file for 1,015 numbers in 337, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 55 |
| 2024 | 48 |
| 2025 | 98 |
Other area codes in Louisiana
Louisiana is one state with 6 area codes in the NANPA table. 337 is one of them.
Next to 337 in the numbering table
These are the codes just before and after 337 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 337 was first assigned in Louisiana. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Louisiana next to a 337 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 337
Where is area code 337?
NANPA assigns area code 337 to Louisiana, United States.
In which state does area code 337 sit?
Louisiana. 337 is one of 6 area codes the NANPA table assigns to the state.
Which places does area code 337 cover?
The places with the most ZIP codes among the rate centers in 337 are Lafayette, LA, Lake Charles, LA and New Iberia, LA. The rate center list on this page shows all of them.
Who owns area code 337?
NANPA assigns area codes. Within 337, South Central Bell Tel holds the most prefixes, 139 prefixes or 23%.
Which time zone does 337 use?
The NANPA NPA report lists the time zone for 337 as Central (C).
What year did 337 enter service?
The NANPA NPA report gives an in-service date of 1999-10-11, so 337 has been in use since 1999.
Does area code 337 have an overlay?
The NANPA NPA report lists no other area code in an overlay with 337.
Which area codes are nearest to 337?
The area codes closest to 337, measured between the centers of the ZIP code places they serve, are 225 (about 89 miles), 409 (about 96 miles), 985 (about 132 miles), 318 (about 135 miles) and 504 (about 152 miles).
How many prefixes does area code 337 have?
NANPA's report dated 2026-10-17 lists 599 prefixes in service in 337, spread over 75 rate centers and 49 holders.
Are there complaints about 337 numbers?
The FCC data on file has 1,353 complaints for 1,015 numbers in 337. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.