The 640 area code covers the same area as 609, including Atlantic City, Trenton and 43 more places in New Jersey.
Area code 640 is in New Jersey, on Eastern Time. In the 640 area, phone numbers are given out most in Atlantic County, then Mercer and Burlington counties. It has been in service since September 17, 2018. 609 covers the same area, so two neighbours can have different area codes.
- Where
- 8 counties in New Jersey, mostly Atlantic County, Mercer County and Burlington County
- Time zone
- Eastern Time
- In service since
- September 17, 2018
- Shares its area with
- 609 (since 1957)
- Prefixes in use
- 132
- How to dial
- Local calls need all 10 digits: 640-555-0142.
Find out who called you from a 640 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (640) number is on today, use our free carrier lookup.
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Atlantic City holds 13% of the phone prefixes in area code 640.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 132 prefixes in use shows where 640 numbers are actually given out.
- Atlantic City17 prefixes, 13%
- Pleasantville14 prefixes, 11%
- Trenton7 prefixes, 5%
- Princeton7 prefixes, 5%
- Allentown6 prefixes, 5%
- Cranbury5 prefixes, 4%
- Barnegat5 prefixes, 4%
- Mount Holly4 prefixes, 3%
Also served: Barnegat, Burlington, Bordentown and Cranbury and 33 smaller places.
AT&T Mobility holds the most phone number prefixes in area code 640: 33 of 132.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 132 prefixes in use in 640 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| AT&T MobilityMobile network | 33 | 25% |
| T-MobileMobile network | 16 | 12% |
| BandwidthSupplies numbers to VoIP and app-based phone services | 7 | 5% |
| Fractel | 7 | 5% |
| Boost MobileMobile phone service | 4 | 3% |
| Nuso | 4 | 3% |
| 16 other carriers | 61 | 46% |
100% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
640 started in 2018 as an overlay on 609, and its ground has not changed since.
2018
640 starts on September 17, 2018, as an overlay on 609: new numbers on the same ground.
A 640 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 640 are 856, 732 and 215.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 640.
Where is area code 640?
640 covers Atlantic City, Trenton, Princeton and Pleasantville and 41 more places in New Jersey. In the 640 area, phone numbers are given out most in Atlantic County, then Mercer and Burlington counties.
What state is area code 640 in?
New Jersey. 640 is a New Jersey area code on Eastern Time.
What cities use area code 640?
The places holding the most 640 prefixes are Atlantic City, Trenton, Princeton, Pleasantville, Allentown, Mount Holly, Haddonfield and Wildwood, out of 45 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 640?
No single phone company owns 640. NANPA's records show AT&T Mobility holds the most 640 prefixes, 33 of 132, followed by T-Mobile and Bandwidth. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 640 in?
640 is on Eastern Time.
When did area code 640 start?
640 went into service on September 17, 2018, as an overlay on 609: new numbers for the same area.
Is 640 the same area as 609?
Yes. 609 (since 1957) covers the same ground as 640. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 640 number?
Local calls need all 10 digits: 640-555-0142.
Is 640 a toll-free number?
No. 640 is a regular area code for Atlantic City and Trenton in New Jersey, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 640?
The closest are 856 (Camden, New Jersey), 732/848 (New Brunswick, New Jersey), 215/267/445 (Philadelphia, Pennsylvania) and 908 (Elizabeth, New Jersey), measured between the centres of each area.
Who called me from a 640 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 640 a scam?
640 is a real New Jersey area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.