The 551 area code is located in the state of New Jersey, and according to Intelius data, covers roughly 44,726 phone numbers and 51,501 listings across 282 prefixes.
This is a General Purpose Code, in service since December 29, 2001.
Area code 551 is part of an overlay complex shared with:
Area code 551 was split from area code 201.
Local and long-distance calls within area code 551 both require 10 digits dialing.
Have you received a call from a number with a 551 area code? Figure out who is calling you by performing a reverse phone lookup search. Intelius can provide you with a phone report that includes (when available) original line type and carrier, the number owner’s name, last known address and past addresses, age, possible relatives, and more.
| County Population (2025) | 977,026 |
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| County Population (2025) | 735,033 |
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