640 Area Code — Trenton, NJ
Area code 640 serves Trenton and 2 other cities in New Jersey. Local time follows America/New_York. It overlays with 609, so 10-digit dialling is required.
- State
- New Jersey
- Primary city
- Trenton
- Timezone
- America/New_York
- In service since
- 2018
- Type
- Overlay
- Overlay codes
- 609
Overlay of 609
Cities Served by 640
The 640 area code covers 3 cities and communities in New Jersey.
- Trenton
- Atlantic City
- Cherry Hill
About Area Code 640
Area code 640 is a North American Numbering Plan (NANP) area code that has been in service since 2018. It is administered by NANPA on behalf of the FCC and serves the New Jersey region anchored on Trenton.
640 is an overlay code, which means it shares its geographic boundaries with one or more existing area codes (609). Overlays are created when a region exhausts the supply of phone numbers in its original area code. Within an overlay region, residents must dial all 10 digits even for local calls, because the same 7-digit number can exist under multiple area codes.
Mobile numbers in 640 are portable: a person who moved away from Trenton may still carry a 640 mobile number on their device. If you receive an unexpected call from a 640 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in New Jersey, you may also interact with neighbouring or overlay codes (609). See the related codes section below to explore the rest of New Jersey.
Other New Jersey Area Codes
Continue exploring the New Jersey numbering plan.
640 Area Code FAQ
Where is area code 640?
Area code 640 is located in New Jersey, primarily serving Trenton and surrounding cities including Atlantic City, Cherry Hill. The region operates on ET (America/New_York) time.
What state is 640 area code?
640 is a New Jersey area code. It was put into service in 2018 as an overlay and shares its geographic footprint with overlay code 609.
Is 640 a scam area code?
640 is a legitimate North American area code allocated by NANPA to New Jersey. Like any geographic area code, scammers sometimes spoof 640 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 640 use?
Area code 640 operates on ET (America/New_York). Numbers in this area code follow standard New Jersey time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 640 phone number?
Yes. Use the reverse lookup widget above to enter a full 640 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.
What's the difference between 640 and 609?
640 and 609 cover the same New Jersey geographic area as overlay codes. Calls between them are local, but you must dial all 10 digits. New phone numbers in this region are assigned from either pool depending on what's available with the carrier at signup.