North American Numbers Source-cited · ownership disclosed
Area code
640
In service
United States · since 2018

Trenton / Atlantic City (overlay)

A 2018 overlay of area code 609, covering the same south-central and shore NJ territory including Trenton, Princeton, and Atlantic City.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Trenton / Atlantic City (overlay)
Type
geographic
Status
in service
In service since
2018
Projected exhaust
2046 Q3

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 640 is

Same footprint as 609 (Mercer, Burlington, Atlantic, Cape May, Ocean, Hunterdon, Monmouth, part of Middlesex)..

Communities served wholly or partly by 640:

TrentonPrincetonAtlantic CityLong Beach Island

Not geographically distinct from 609; shares the same footprint.

B · Relationships

How it relates to other codes

The codes 640 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 · 2018 609 Trenton / Atlantic City 640 overlays the entire 609 area; both serve identical geography.
What's changing. Overlay of 609 (same territory).
C · History

How 640 got here

2018-08-18
Ten-digit dialing became mandatory ahead of the overlay.
Source: Wikipedia
2018-09-17
Area code 640 entered operation as an overlay of 609.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
145
Prefixes available
655
Thousands-blocks assigned
1,198

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

Compare 640 with another code →
Sources
Wikipedia ↗
Area code 640
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.