Area code 551 – New Jersey
551 has served New Jersey since 2001, split from 201. 300 of its 786 number blocks are allocated (38%). No carrier dominates: Onvoy / Inteliquent 23.7%, T-Mobile 22.3%, Verizon 15.7%. It shares its geography with overlay codes 201, so local calls take all ten digits. FTC complaints naming a 551 caller ID totalled 648 in the 33 days to 30 October 2026 (159th of 422 ranked codes).
- State
- New Jersey
- In service since
- 2001
- Time zone
- Eastern
- Shares area with
- 201
Who holds 551 number blocks
Share of the 300 assigned NXX blocks (38.2% of the 786 possible), across 29 carriers. This is share of number blocks, not of subscribers.
- T-Mobile24%
- Onvoy23.7%
- Verizon15.7%
- Other CLEC / VoIP13%
- AT&T9.7%
- Bandwidth5%
- Altice3%
- Lumen2%
- Peerless1%
- Vonage1%
- Telnyx0.7%
- Charter0.7%
- Dish0.3%
- VoIP Innovations0.3%
Spam complaints naming 551
FTC Do Not Call complaints where the caller ID was a 551 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 551
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 23.
Timeline
- 2001 551 goes into service, split from or overlaid on 201.
More about 551
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 551
What state is area code 551?
New Jersey. It covers the same area as 201/551.
Is a call from 551 a scam?
Not by itself. 551 drew 648 FTC complaints in the 33 days to 30 October 2026, 159th 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 551 numbers?
Onvoy / Inteliquent holds the largest share of assigned number blocks at 23.7%. 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 551?
Yes – ten digits for local calls in 551, 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.