Area code 337 – Louisiana
337 has served Louisiana since 1999, split from 318. 599 of its 786 number blocks are allocated (76%). AT&T is the largest holder with 41.9% of blocks, ahead of Other CLEC / VoIP at 17.9%. FTC complaints naming a 337 caller ID totalled 551 in the 33 days to 30 October 2026 (192nd of 422 ranked codes).
- State
- Louisiana
- In service since
- 1999
- Time zone
- Central
- Shares area with
- No overlay
Who holds 337 number blocks
Share of the 599 assigned NXX blocks (76.2% of the 786 possible), across 50 carriers. This is share of number blocks, not of subscribers.
- AT&T41.9%
- Other CLEC / VoIP14.7%
- Verizon9.2%
- Windstream5.7%
- Lumen5.7%
- Brightspeed5.5%
- Onvoy4.7%
- T-Mobile4%
- Comcast3.7%
- Charter1.5%
- Spok1%
- Bandwidth0.8%
- Consolidated0.7%
- Dish0.3%
- Vonage0.2%
- Telnyx0.2%
- American Messaging0.2%
- Twilio0.2%
Spam complaints naming 337
FTC Do Not Call complaints where the caller ID was a 337 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 337
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 75.
Timeline
- 1999 337 goes into service, split from or overlaid on 318.
More about 337
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 337
What state is area code 337?
Louisiana.
Is a call from 337 a scam?
Not by itself. 337 drew 551 FTC complaints in the 33 days to 30 October 2026, 192nd of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 337 numbers?
AT&T holds the largest share of assigned number blocks at 41.9%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 337?
Yes – ten digits for local calls in 337, because it shares its area with another code.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.