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US area code · New Jersey

640 area code

Where the 640 area code is, its overlay and how to dial a +1 640 number from anywhere.

CoversNew JerseyTime zoneEastern (ET)TypeOverlay
Quick answer

The 640 area code is in New Jersey, United States (Eastern (ET)). To call from abroad: +1 640 555-0123. It is an overlay, so all 10 digits are dialled.

StateNew Jersey
Time zoneEastern (ET)
TypeOverlay
10-digit dialingRequired
In service since21-Apr-2017

The 640 area code is a geographic North American Numbering Plan (NANP) code covering New Jersey. It has been in service since 21-Apr-2017 and sits in the Eastern (ET) time zone.

Overlay 640 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

How to dial a 640 number

From abroad+1 640 555-0123
Within the US / Canada1 640 555-0123
Locally (same area)640 555-0123

Other New Jersey area codes

Frequently asked questions

Where is the 640 area code?

The 640 area code is in New Jersey, United States (Eastern (ET)).

Is 640 an overlay area code?

Yes. 640 overlays the same region as 609, so callers dial all 10 digits.

Do I have to dial 10 digits for 640?

Yes — dial the area code plus the seven-digit number.

How do I call a 640 number from another country?

Dial your exit code (or +), then 1, then 640, then the number: +1 640 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 640 number does not pinpoint a street or ZIP code.

Number holders in area code 640

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 145 prefixes are in use in 640, shared by 24 companies. The largest holders:

CompanyPrefixesShare
New Cingular Wireless PCS, LLC3323%
Onvoy, LLC2719%
Omnipoint Communications Enterprises, LP1611%
Multiple Ocn Listing96%
Cellco Partnership Dba Verizon Wireless86%
Bandwidth.Com CLEC, LLC75%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 640 numbers

Reports to the FTC, last 30 days
129
Recorded messages or robocalls
78%
Rank among area codes
#365 of 670
Most reported subjects
Reducing your debt (credit cards, mortgage, student loans) (54)
Other (39)
Dropped call or no message (12)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

All US area codes United States +1 Map of area code 640 — cities & rate centres

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