Cities in area code 551

22 localities · NANPA data, current as of July 28, 2026.

These are the cities and communities covered by 551 in New Jersey. "Covered" means the locality is a rate center holding 551 prefixes; the largest are Jersey City, Hackensack, Bayonne.

By numbering footprint the leading localities are Jersey City, Hackensack, Bayonne, Union City, Ramsey, Fair Lawn, Cliffside and Kearny, and 13 smaller communities down to single-prefix localities. Prefix counts track lines in service, so the ranking is a reasonable proxy for where the code's subscribers actually are.

22 of the localities fall within FCC top-100 metropolitan statistical areas; the rest are smaller communities.

22 of these localities are also reachable through other area codes — overlay territory where the same place answers to several codes.

All of the code's territory keeps Eastern time.

Remember that people keep numbers when they relocate, so a 551 number is a where-it-was-issued fact, not a where-they-are fact.

FAQ

What is the biggest city in area code 551?

Jersey City holds the most active prefixes (53), making it the code's largest numbering locality.

How many places does 551 cover?

22 rate centers in New Jersey hold active 551 prefixes, from Jersey City down to communities with a single prefix.

Does a 551 number guarantee the caller lives in one of these places?

No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.