The 337 area code covers Lafayette, Lake Charles and 63 more places in Louisiana.
Area code 337 is in Louisiana, on Central Time. In the 337 area, phone numbers are given out most in Lafayette Parish, then Calcasieu Parish and St. Landry Parish. It has been in service since October 11, 1999.
- Where
- 8 counties in Louisiana, mostly Lafayette Parish, Calcasieu Parish and St. Landry Parish
- Time zone
- Central Time
- In service since
- October 11, 1999
- Shares its area with
- No other area code
- Prefixes in use
- 599
- How to dial
- Local calls need all 10 digits: 337-555-0142.
Find out who called you from a 337 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (337) number is on today, use our free carrier lookup.
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Lafayette holds 22% of the phone prefixes in area code 337.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 599 prefixes in use shows where 337 numbers are actually given out.
- Lafayette130 prefixes, 22%
- Lake Charles80 prefixes, 13%
- New Iberia28 prefixes, 5%
- Leesville22 prefixes, 4%
- Opelousas21 prefixes, 4%
- Abbeville18 prefixes, 3%
- Sulphur15 prefixes, 3%
- Crowley15 prefixes, 3%
Also served: Deridder, Jennings, Broussard and Eunice and 53 smaller places.
BellSouth (AT&T) holds the most phone number prefixes in area code 337: 139 of 599.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 599 prefixes in use in 337 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| BellSouth (AT&T)AT&T's landline company | 139 | 23% |
| AT&T MobilityMobile network | 98 | 16% |
| PAETEC (Windstream)Windstream's business phone network | 34 | 6% |
| BrightspeedLandline company | 33 | 6% |
| Level 3 (Lumen)Lumen's business and wholesale network | 31 | 5% |
| Metro by T-MobileT-Mobile's prepaid brand | 24 | 4% |
| 40 other carriers | 240 | 40% |
71% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
337 has covered the same ground since 1999.
1999
337 starts on October 11, 1999, split off from 318.
A 337 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 337 are 225, 409 and 318.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
Louisiana has 5 other area codes.
These are the questions people ask most about area code 337.
Where is area code 337?
337 covers Lafayette, Lake Charles, New Iberia and Leesville and 61 more places in Louisiana. In the 337 area, phone numbers are given out most in Lafayette Parish, then Calcasieu Parish and St. Landry Parish.
What state is area code 337 in?
Louisiana. 337 is a Louisiana area code on Central Time.
What cities use area code 337?
The places holding the most 337 prefixes are Lafayette, Lake Charles, New Iberia, Leesville, Opelousas, Abbeville, Sulphur and Crowley, out of 65 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 337?
No single phone company owns 337. NANPA's records show BellSouth (AT&T) holds the most 337 prefixes, 139 of 599, followed by AT&T Mobility and PAETEC (Windstream). Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 337 in?
337 is on Central Time.
When did area code 337 start?
337 went into service on October 11, 1999, when it was split off from 318.
How do I dial a 337 number?
Local calls need all 10 digits: 337-555-0142.
Is 337 a toll-free number?
No. 337 is a regular area code for Lafayette and Lake Charles in Louisiana, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 337?
The closest are 225 (Baton Rouge, Louisiana), 409 (Beaumont, Texas), 318/457 (Shreveport, Louisiana) and 985 (Houma, Louisiana), measured between the centres of each area.
Who called me from a 337 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 337 a scam?
337 is a real Louisiana area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.