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551 Area Code

Area Code Overview

Area code 551 is a geographic telephone area code in New Jersey that went into service on December 29, 2001. The geographic regions covered by this area code overlay has a population of approximately 2,118,595.

Overlay and Dialing Rules

  • Area Code: 551
  • State: New Jersey
  • Type: General Purpose Code
  • In Service Date: December 29, 2001
  • Overlay Complex: 201/551
  • Local Dialing Plan: This area does require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 551

This area code is tied for 268th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 8th out of 10.

2,781,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 551

Total assigned 2,781,000
Wireless
1,270,000 assigned
45.67%
Wireline and VoIP
1,336,000 assigned
48.04%
Other / Unclassified
175,000 assigned
6.29%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 551

Estimated assigned wireless phone numbers: 1,270,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

T-Mobile 545,000 (42.91%)
Verizon Wireless 407,000 (32.05%)
AT&T Wireless 304,000 (23.94%)
Optimum Mobile 14,000 (1.10%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 551

Estimated assigned wireline and VoIP phone numbers: 1,336,000

Onvoy 742,000 (55.54%)
Bandwidth 190,000 (14.22%)
Spectrum 89,000 (6.66%)
Peerless Network 76,000 (5.69%)
Vonage 41,000 (3.07%)
Telnyx 38,000 (2.84%)
Commio 31,000 (2.32%)
Lumen 31,000 (2.32%)
CABLEVISION LIGHTPATH, INC. - NJ 30,000 (2.25%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 17,000 (1.27%)
NUSO 14,000 (1.05%)
PAETEC ITEL, LLC 11,000 (0.82%)

Other / Unclassified Assigned Numbering in Area Code 551

Estimated assigned other or unclassified phone numbers: 175,000

IP HORIZON LLC 41,000 (23.43%)
TELEPORT COMMUNICATIONS AMERICA, LLC - NJ 31,000 (17.71%)
HD CARRIER LLC 20,000 (11.43%)
FRACTEL, LLC 19,000 (10.86%)
BLUEBIRD COMMUNICATIONS, LLC - NJ 18,000 (10.29%)
TON80 COMMUNICATIONS, LLC 17,000 (9.71%)
CORETEL NEW JERSEY, INC. - NJ 15,000 (8.57%)
CSC VOICE, LLC 5,000 (2.86%)
THE VOICE APPLICATION NETWORK, LLC 5,000 (2.86%)
FUSION, LLC 2,000 (1.14%)
BUSINESS AUTOMATION TECHNOLOGIES, INC. - NJ 1,000 (0.57%)
WAVENATION, LLC 1,000 (0.57%)

Cities and Towns in Area Code 551

Bayonne, New Jersey Caldwell, New Jersey Cliffside Park, New Jersey Closter, New Jersey Cragmere Park, New Jersey Dumont, New Jersey Englewood, New Jersey Fair Lawn, New Jersey Hackensack, New Jersey Hasbrouck Heights, New Jersey Jersey City, New Jersey Kearny, New Jersey Leonia, New Jersey Morristown, New Jersey Newark, New Jersey Oakland, New Jersey Oradell, New Jersey Park Ridge, New Jersey Passaic, New Jersey Ramsey, New Jersey Ridgewood, New Jersey Rutherford, New Jersey Succasunna, New Jersey Teaneck, New Jersey Union City, New Jersey Westwood, New Jersey Wyckoff, New Jersey

These geographic regions are also served by area code 201.

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 551, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm