🇺🇸 640 area code
Area code 640 covers Trenton, Princeton, Ewing Township and Atlantic City and the surrounding area in New Jersey. It shares that territory with 609, so the same neighbourhood can have numbers in any of them. Enter a 640 number below for a free check before you call back.
- Location: Trenton, New Jersey
- Time zone: Eastern (UTC−5)
- In service since September 17, 2018
Look up a number
Validity, carrier, line type, and region on the first pass.
Area code 640 at a glance
- Area code
- 640
- Location
- New Jersey, United States
- Main cities
- Trenton, Princeton, Ewing Township, Atlantic City, Barnegat Township, Forked River
- Time zone
- Eastern (UTC−5)
- Local time now
- —
- In service since
- September 17, 2018
- Created from
- 609
- Overlay codes
- 609
- Local calls
- Dial 10 digits
- Number format
- (640) 555-0123
- From abroad
- +1 640 555 0123
Cities in the 640 overlay area
- Trenton
- Princeton
- Ewing Township
- Atlantic City
- Barnegat Township
- Forked River
- Galloway
- Hammonton
- Lawrenceville
- Medford
Is a 640 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 640 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 640 number to people in New Jersey because a local-looking call is more likely to be answered. If a 640 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 640
640 entered service on September 17, 2018, as an overlay on 609, which had run short of numbers.
It is part of the 609/640 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Because 640 overlays the same ground, the cities listed are those of the codes it shares with.
Area codes
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FAQ
Area code 640 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 640?
Area code 640 is in New Jersey, United States. It covers Trenton, Princeton, Ewing Township, Atlantic City, Barnegat Township and Forked River.
What time zone is area code 640?
640 is in the Eastern (UTC−5) time zone, and observes daylight saving time.
What area codes overlay 640?
609 serves the same area as 640. Numbers in all of them are local to one another.
When did area code 640 start?
640 entered service on September 17, 2018, created from 609.
How do I find out who called me from 640?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 640?
If you live in or near New Jersey, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 640 callers who will not leave a message are best looked up before you call back.
Got a call from 640?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.