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US area code · New Jersey

Area code 640

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.

640609

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

201551609732848856862908973

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.

Missed a call from +1 640?

In the 30 days to September 24, 2026, 129 unwanted calls showing a 640 number were reported to the US Federal Trade Commission, 78% of them recorded messages or robocalls. That puts 640 at #365 of 670 area codes reported.

Reducing your debt (credit cards, mortgage, student loans)54
Other39
Dropped call or no message12
Calls pretending to be government, businesses, or family and friends10
Before you call back
  • If you do not know anyone in New Jersey, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 640 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 640 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 640:

New Cingular Wireless PCS, LLC 33Onvoy, LLC 27Omnipoint Communications Enterprises, LP 16Multiple Ocn Listing 9Cellco Partnership Dba Verizon Wireless 8Bandwidth.Com CLEC, LLC 7

About 28.3% of the 145 prefixes in use belong to mobile carriers: a 640 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

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