North American Numbers Source-cited · ownership disclosed
Area code
551
In service
United States · since 2001

Jersey City / Hackensack (overlay)

A 2001 overlay of area code 201, covering the same northeastern NJ territory (Bergen and Hudson counties) opposite New York City.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Jersey City / Hackensack (overlay)
Type
geographic
Status
in service
In service since
2001
Projected exhaust
2048 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 551 is

Bergen and Hudson counties (northeastern NJ, bordering NYC)..

Communities served wholly or partly by 551:

Jersey CityHackensackHobokenBayonneSecaucusEnglewood

Not geographically distinct from 201; shares the same footprint.

B · Relationships

How it relates to other codes

The codes 551 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2001 201 Jersey City / Hackensack 551 overlays the entire 201 area; both serve identical geography.
What's changing. Overlay of 201 (same territory).
C · History

How 551 got here

2001-12-01
Introduced as an overlay of 201 (alongside 848/732 and 862/973 overlays statewide); ten-digit dialing became mandatory in northern NJ.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
315
Prefixes available
485
Thousands-blocks assigned
2,809

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 551 with another code →
Sources
Wikipedia ↗
Area code 551
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.