551 Area Code: Location, Cities, and Time Zone
If you received a call or text from a number beginning with 551, you may be wondering where it comes from and whether it belongs to a particular city or region. The 551 area code is associated with northeastern New Jersey and is closely connected with the older 201 area code.
Area codes can provide useful geographic context, but they do not necessarily tell you where a caller currently lives. People can keep phone numbers when they move, and mobile and VoIP numbers can be used from locations far from their original service area.
This guide explains exactly where the 551 area code is used, which communities it serves, what time zone it follows, how the 551 and 201 overlay works, and what to know if you receive an unfamiliar call from this area code.
Key Takeaways
- The 551 area code serves northeastern New Jersey.
- It is an overlay of area code 201, meaning both codes serve the same general numbering area.
- The region is centered primarily on Bergen and Hudson counties.
- Major communities associated with the 201/551 area include Jersey City, Bayonne, Hoboken, Hackensack, Union City, and Fort Lee.
- The area code follows the Eastern Time Zone.
- 551 was introduced in 2001 as an overlay to provide additional telephone numbers.
- A 551 number does not automatically indicate that a call is legitimate or fraudulent.
Main Article
What Is the 551 Area Code?
The 551 area code is a North American Numbering Plan (NANP) area code assigned to New Jersey. It operates as an overlay with area code 201, serving the same general geographic region. NANPA records identify 551 as a New Jersey area code within the 201/551 overlay complex.
An overlay means that two different area codes can be assigned to phone numbers within the same geographic area. Instead of dividing the region into two separate territories, the numbering system allows both 201 and 551 numbers to coexist.
This is important because seeing a 551 number does not necessarily mean the caller is from a different part of New Jersey than someone with a 201 number.
The 551 area code was introduced in 2001 after the existing 201 numbering area needed additional telephone numbers. NANPA’s planning records specifically identify 551 as an overlay for 201.
Where Is the 551 Area Code Located?
The 551 area code is located in northeastern New Jersey, particularly in and around the densely populated communities near the New York metropolitan area.
Its core coverage is associated with Bergen County and Hudson County, including communities immediately west of the Hudson River and the New York City metropolitan region. Some numbering databases also show assignments extending into neighboring areas, so the exact locality associated with a particular 551 number can depend on its telephone exchange.
Some of the best-known communities associated with the 201/551 numbering area include:
- Jersey City
- Bayonne
- Hoboken
- Union City
- North Bergen
- Secaucus
- Fort Lee
- Hackensack
- Englewood
- Fair Lawn
- Kearny
- Cliffside Park
- Leonia
- Edgewater
- West New York
Because 551 is an overlay rather than a geographically isolated code, it is better to think of it as part of the 201/551 northeastern New Jersey numbering region rather than as an area code belonging to only one city.
Which Cities Use the 551 Area Code?
There is no single “551 city.” The area code can appear in phone numbers assigned throughout its service area.
Jersey City
Jersey City is one of the largest and most prominent communities associated with the 201/551 numbering region. Located directly across the Hudson River from Manhattan, it is an important residential, commercial, and transportation center.
A Jersey City phone number can have either the 201 or 551 area code because of the overlay arrangement.
Bayonne
Bayonne is another Hudson County community associated with the area. The city occupies a peninsula between Newark Bay and New York Bay and has strong connections to the broader New York metropolitan area.
Hoboken
Hoboken is well known for its location directly across the Hudson River from Manhattan. Phone numbers in the area can use either 201 or 551.
Hackensack
Hackensack is the county seat of Bergen County and is another important community within the northeastern New Jersey numbering region.
Union City and North Bergen
These densely populated Hudson County communities are also closely associated with the 201/551 overlay area. Their proximity to Manhattan makes them an important part of the metropolitan telephone network.
551 Area Code and 201: What’s the Difference?
The simplest way to understand the relationship is this:
| Area Code | Location | Relationship |
|---|---|---|
| 201 | Northeastern New Jersey | Original area code |
| 551 | Northeastern New Jersey | Overlay for 201 |
Area code 201 has a much longer history. It was one of the original area codes created when the North American Numbering Plan was established in 1947. After subsequent geographic splits, 201 became concentrated in northeastern New Jersey.
By the late 1990s, the 201 region was again facing pressure on its supply of available numbers. Rather than splitting the territory geographically once more, regulators approved an overlay.
NANPA’s records show that the 551 overlay was formally planned in 2001.
The result is the 201/551 overlay complex that exists today.
Why Was the 551 Area Code Created?
The main reason was straightforward: more telephone numbers were needed.
The rapid growth of wireless phones, fax machines, pagers, business lines, and other telecommunications services increased demand for telephone numbers. Northeastern New Jersey, particularly the densely populated Bergen and Hudson County region, had limited numbering resources.
New Jersey used overlays as one way to expand numbering capacity without requiring every existing customer to change area codes.
A New Jersey government document explains that in 2001, new area codes including 551 were approved as overlays in existing geographic areas.
This approach allowed existing 201 customers to keep their numbers while new numbers could be assigned with 551.
What Time Zone Is the 551 Area Code In?
The 551 area code is in the Eastern Time Zone.
That means the region observes:
- Eastern Standard Time (EST) during standard time
- Eastern Daylight Time (EDT) during daylight saving time
The time zone is the same as New York City and Washington, D.C.
For someone calling a 551 number from another part of the United States, knowing the time zone can help avoid calling too early or too late.
For example, if you are in California and it is 9:00 a.m. Pacific Time, it is already noon in the 551 area.
Do You Need to Dial 10 Digits for a 551 Number?
Yes. Because 551 operates as an overlay with 201, callers in the region use 10-digit dialing for local calls: the three-digit area code followed by the seven-digit telephone number.
For example:
551-XXX-XXXX
The same principle applies to 201 numbers in the overlay region.
The introduction of overlays in New Jersey was associated with mandatory use of the area code when placing calls, because two area codes could exist within the same geographic area.
For modern mobile phones, this usually feels completely normal because contacts are generally stored with the full area code and phone number.
Is 551 a Toll-Free Area Code?
No. 551 is not a toll-free area code.
It is a geographic area code assigned to New Jersey. Toll-free numbers use special codes such as 800, 888, 877, 866, 855, 844, and 833.
Whether a call to a 551 number costs extra depends on your telephone plan, carrier, and calling location.
If you have unlimited domestic calling, a call within the United States may be included in your plan. However, international callers should check their provider’s rates.
Is a 551 Phone Number From New Jersey?
Usually, a 551 number is associated with the northeastern New Jersey numbering area.
However, an area code should not be treated as proof of a caller’s current physical location.
This distinction matters because telephone numbers can be:
- Kept after someone moves
- Ported between carriers
- Used on mobile phones
- Assigned to businesses
- Used through VoIP services
- Forwarded to another number
For that reason, a person with a 551 number may currently live or work somewhere else.
The area code tells you about the number’s assigned numbering region, not necessarily the caller’s present location.
Is the 551 Area Code a Scam?
The 551 area code itself is not a scam. It is a legitimate New Jersey telephone area code.
However, scammers can use phone numbers with legitimate area codes. This is possible because caller ID information can be manipulated or because fraudulent callers may obtain real telephone numbers.
Therefore, receiving a call from 551 does not automatically mean the caller is trustworthy.
Signs of a Potential Scam Call
Be cautious if an unfamiliar caller:
- Demands immediate payment
- Requests passwords or verification codes
- Claims you have won a prize you never entered
- Threatens arrest or account closure
- Asks for banking information
- Pressures you to install software
- Insists that you keep the conversation secret
- Uses urgency to prevent you from checking the claim
A familiar-looking New Jersey area code should not override these warning signs.
What Should You Do With an Unknown 551 Call?
If you do not recognize the number, consider letting the call go to voicemail.
If the caller claims to represent a bank, government agency, delivery company, or another organization, independently find that organization’s official contact information and contact it yourself.
Do not rely solely on the telephone number displayed on your screen to verify the caller’s identity.
Can You Identify a Person From a 551 Number?
Not reliably.
An area code can indicate a general numbering region, but it does not identify a specific individual.
Even a complete phone number may not provide reliable information about its current user because numbers can be transferred, reassigned, ported between carriers, or used through internet-based phone systems.
If you are trying to determine who called you, focus on the context of the call rather than assuming the area code identifies the person.
Why Do Businesses Use 551 Numbers?
A local-looking telephone number can be useful for businesses serving northeastern New Jersey.
Companies may use a 551 number for:
- Customer service
- Sales departments
- Local offices
- Appointment scheduling
- Business communications
- Marketing campaigns
- Text messaging
A 551 number can provide a local presence in the region, particularly for companies that serve customers in Bergen, Hudson, and surrounding communities.
However, the area code itself does not prove that a company is physically headquartered in New Jersey.
551 Area Code vs. Nearby New Jersey Area Codes
New Jersey has several area codes serving different parts of the state.
| Area Code | General Region |
|---|---|
| 201 | Northeastern New Jersey |
| 551 | Overlay of 201 |
| 973 | Northern New Jersey |
| 862 | Overlay of 973 |
| 732 | Central New Jersey |
| 848 | Overlay of 732 |
| 609 | Central and southern New Jersey |
| 640 | Overlay of 609 |
| 856 | Southern New Jersey |
The boundaries are not always intuitive, particularly because mobile numbers and overlays have changed the way people associate phone numbers with physical locations.
The important distinction is that 551 specifically forms an overlay with 201.
When Did the 551 Area Code Start?
The 551 area code was introduced in 2001.
NANPA’s planning records identify the 551 NPA as an overlay for 201, while later NANPA reports continue to list the two codes together as the 201/551 overlay complex.
This makes 551 considerably newer than 201, which dates back to the original 1947 North American area-code system.
The creation of 551 reflects a broader trend in telecommunications: as the number of devices and telephone services increased, existing geographic area codes needed additional numbering capacity.
Frequently Asked Questions
What state is the 551 area code in?
The 551 area code is in New Jersey, primarily serving the northeastern part of the state and operating as an overlay with area code 201.
What cities are in the 551 area code?
Communities associated with the 201/551 region include Jersey City, Bayonne, Hoboken, Hackensack, Union City, North Bergen, Fort Lee, Secaucus, Englewood, and Fair Lawn, among others.
What time zone is 551?
The 551 area code follows the Eastern Time Zone, using Eastern Standard Time in standard-time months and Eastern Daylight Time during daylight saving time.
Is 551 the same as 201?
Not exactly. They are different area codes, but 551 is an overlay of 201, so both area codes serve the same general geographic numbering area.
Is 551 a New Jersey area code?
Yes. The North American Numbering Plan identifies 551 as a New Jersey area code.
Is a call from 551 necessarily a scam?
No. 551 is a legitimate geographic area code. However, scammers can use legitimate area codes, so you should evaluate an unfamiliar caller based on what they request and how they behave.
Can a 551 number be used outside New Jersey?
Yes. Mobile phones, number portability, VoIP services, and call forwarding mean that the person using a 551 number does not necessarily have to be physically located in New Jersey.
Do I need the area code when calling a 551 number?
Yes. Because 551 is part of the 201/551 overlay, 10-digit dialing is used in the region. That means you should include the three-digit area code with the seven-digit phone number.
Conclusion
The 551 area code is a legitimate New Jersey telephone area code serving the northeastern part of the state. It was introduced in 2001 as an overlay for the established 201 area code, creating the 201/551 numbering complex.
The region is closely associated with Bergen and Hudson counties and communities such as Jersey City, Bayonne, Hoboken, Hackensack, Union City, North Bergen, and Fort Lee. The area uses the Eastern Time Zone and relies on 10-digit dialing because 201 and 551 share the same geographic numbering area.
If you see a 551 number on your phone, the area code provides useful geographic context, but it should not be treated as proof of the caller’s identity or current location. A legitimate New Jersey number can belong to an individual, business, mobile user, or VoIP customer, while scammers can also exploit familiar area codes.
Understanding the 551 area code therefore comes down to three key facts: it is a New Jersey code, it overlays 201, and it serves the northeastern New Jersey region on Eastern Time.
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