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New Jersey · United States

Area code 551: where it is and who calls from it

  • ET (UTC−5/−4)
  • Overlays: 201

Reviewed by Sujan ThapaliyaLast updated

What is area code 551?

Area code 551 serves Jersey City, Hackensack, Bayonne, Fort Lee in New Jersey, United States. It is in the ET (UTC−5/−4) time zone, and it shares its territory with the overlay code 201.
Where area code 551 sits in a North American number: the three-digit area code, then the three-digit exchange code, then the four-digit line number, all under country code 1. The diagram also shows the two validity rules — an area code never starts with 0 or 1, and a repeated middle digit marks a service code such as 800 for toll-free rather than a place.
The 1 you dial before a ten-digit number is a long-distance prefix, not part of the number itself.

Area code 551

Type
Geographic area code
State / province
New Jersey
Country
United States
Main cities
Jersey City, Hackensack, Bayonne, Fort Lee, Englewood
Time zone
ET (UTC−5/−4)
Overlay codes
201
Same territory, different code.
In service since
2001

Step by step

How to call a 551 number

The same ten digits, dialled three different ways depending on where you are calling from.

  1. 1

    Within the same area code

    Many carriers still allow seven digits inside 551, but overlays have made ten-digit dialling the safe default — 551 overlaps with 201, so seven digits is ambiguous. Dial 551 followed by the seven-digit number.
  2. 2

    From elsewhere in the US or Canada

    Dial 1, then 551, then the seven-digit number — eleven digits in total. The leading 1 is the North American long-distance prefix, not part of the number.
  3. 3

    From outside North America

    Dial your country's exit code, then 1 for the North American Numbering Plan, then 551, then the seven-digit number. On a mobile, type + instead of the exit code: +1 551 followed by the number works from any country.

Background

About 551

551 is the overlay for 201 and covers north-eastern New Jersey: Bergen and Hudson counties, directly across the Hudson River from Manhattan. Because it is a newer code with lots of unassigned numbers, 551 is heavily used by spoofed spam calls, which is why so many people search whether a 551 call is a scam.

Unwanted calls

Why you are getting 551 calls

The reason an unfamiliar 551 number keeps calling is usually neighbour spoofing: automated systems fake a caller ID in the recipient’s own area code because a local-looking number is answered far more often than an unfamiliar one. The number displayed is frequently not the number placing the call, and may belong to someone with no idea it is being used.

What actually helps:

  • Let unknown numbers go to voicemail. Automated diallers rarely leave a message; a real caller will.
  • Do not press any key to be removed. On an automated call, a keypress confirms a live human and increases the volume you get.
  • Register on the national Do Not Call list and report unwanted calls. It does not stop fraud, but it does constrain legitimate telemarketers.
  • Turn on your carrier’s call-filtering service. Filtering now uses STIR/SHAKEN attestation, which is why properly signed business calls get through and spoofed ones increasingly do not.

If it is your 551 business number being labelled as spam, the cause is different and fixable: unregistered caller ID name, low attestation, or a volume pattern carriers read as automated. Owning your numbers, registering CNAM and signing at Attestation A is what resolves it.

If you are calling into 551 rather than receiving from it, the relevant reading is how local presence works on numbers you own — the same signals that decide whether a call from this code gets answered decide whether yours does.

Frequently asked questions

Where is area code 551?
Area code 551 covers Jersey City, Hackensack, Bayonne, Fort Lee, Englewood in New Jersey, United States.
Is a call from 551 a scam?
Not inherently. 551 is a legitimate area code serving real people and businesses in New Jersey. But spam callers frequently spoof caller ID to display a number in your own area code, a technique called neighbour spoofing. If you do not recognise the number, let it go to voicemail; a genuine caller will leave a message.
What time zone is 551 in?
551 is in the ET (UTC−5/−4) time zone. Check the local time before calling back so you are inside normal business hours.
Can I get a 551 phone number?
Yes. Local numbers in 551 can be provisioned in minutes and used for calls, texts, and as your outbound caller ID. A number in the area code you are calling is answered noticeably more often than an out-of-state one.
What is the difference between 551 and 201?
There is no geographic difference. 201 is an overlay covering exactly the same territory as 551. Overlays were introduced when the original code ran out of numbers, which is why both require ten-digit dialling even for local calls.

Sources

  1. North American Numbering Plan Administrator — NANPAArea code assignments, relief planning, and which codes are in service across the North American Numbering Plan.
  2. ITU-T Recommendation E.164 — The international public telecommunication numbering plan — International Telecommunication UnionThe international number format, the 15-digit maximum, and how country codes and national numbers compose.

Get a 551 number for your business

A local 551 number, owned by you, with your business name on the caller ID and callbacks routed straight to your team. People answer local numbers, and they answer branded ones far more often still.

  • Branded caller ID (CNAM)
  • STIR/SHAKEN Attestation A
  • No subscription
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