---
title: "Area code 337: Louisiana, United States"
url: "https://lookvalid.com/area-code/337.md"
canonical_url: "https://lookvalid.com/area-code/337"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 337 serves Louisiana, United States. Number formats, numbering rules, a live phone validator and the other codes in Louisiana."
---

# Area code 337: Louisiana, United States

Area code 337 serves Louisiana, United States. Number formats, numbering rules, a live phone validator and the other codes in Louisiana.

NANPA lists 599 central office codes (prefixes) in use in area code 337, held by 49 holders across 75 rate centers.
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.
The FCC unwanted-call data has 1,353 complaints on file for 1,015 numbers in 337, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- 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

| 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% |

## Carriers

| 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.

## History

- 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.

## Nearest area codes

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).

## ZIP codes

81 ZIP codes fall in places that have a rate center in this area code. The places with the most are Lafayette, LA (12 ZIP codes), Lake Charles, LA (11 ZIP codes) and New Iberia, LA (3 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

1,353 complaints for 1,015 numbers. Numbers whose latest complaint falls in each year:

- 2023: 55
- 2024: 48
- 2025: 98

## Questions

### 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.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).