Area Code 551: New Jersey, New Jersey
551 is a telephone area code serving New Jersey. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 551 are located in New Jersey, United States (NANP region: Northeast).
How to Dial Area Code 551
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 551 XXX-XXXX (10-digit dialing: 551 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 551 XXX XXXX |
| From Australia | 0011 1 551 XXX XXXX |
| From a mobile phone anywhere | +1 551 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 551 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 551
Calls to a 551 number ring in the America/New_York time zone, standard offset UTC-05:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Other Area Codes in New Jersey
These codes also serve New Jersey. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 201 | Jersey City, Hackensack |
| 609 | Trenton, Atlantic City |
| 640 | Central (overlay) |
| 732 | New Brunswick, Toms River |
| 848 | Central (overlay) |
| 856 | Camden, Cherry Hill |
| 862 | Newark (overlay) |
| 908 | Newark suburbs |
| 973 | Newark, Paterson |
See all 10 area codes in New Jersey →
Frequently Asked Questions
Where is area code 551?
Area code 551 is in New Jersey, United States. It covers Northeast (overlay).
What time zone is area code 551 in?
Area code 551 rings in the America/New_York time zone (UTC-05:00 standard).
Do I need to dial 1 before area code 551?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 551, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 551.
Is area code 551 toll-free?
No. 551 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.