Area code
640
640 is a United States area code. Under the North American Numbering Plan it belongs to New Jersey, which has 10 area codes in total.
Validate a number in 640
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 640 at a glance
NANPA lists 124 central office codes (prefixes) in use in area code 640, held by 20 holders across 35 rate centers.
| Fact | Value |
|---|---|
| In service since | 2018-09-17 |
| Time zone | Eastern (E) |
| Assigned overlays | 609 (1957-01-01) |
| Prefixes in use | 124 |
| Pooled prefixes | 124 (100%) |
| Rate centers | 35 |
| Companies holding prefixes | 20 |
| Assignment dates on file | 2018-11-26 to 2026-05-21 (124 prefixes) |
| ZIP codes in its places | 54 |
Rate centers in area code 640
| Rate center | Prefixes | Share |
|---|---|---|
| ATLNTIC CY | 16 | 13% |
| LAWRENCEVL | 16 | 13% |
| PLEASANTVL | 13 | 10% |
| PRINCETON | 7 | 6% |
| TRENTON | 6 | 5% |
| BARNEGAT | 5 | 4% |
| CRANBURY | 5 | 4% |
| ALLENTOWN | 4 | 3% |
| 27 other rate centers | 52 | 42% |
Who holds the prefixes in 640
New Cingular Wireless PCS holds the most prefixes, 29 (23%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| New Cingular Wireless PCS | 29 | 23% |
| Onvoy | 26 | 21% |
| Omnipoint Communications Enterprises | 16 | 13% |
| Verizon Wireless | 8 | 6% |
| Bandwidth.com CLEC | 7 | 6% |
| Fractel | 7 | 6% |
| 14 other carriers | 31 | 25% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 640
- 1957-01-01 Area code 609, named as the parent of 640 in the NANPA report, was in service.
- 2018-09-17 Area code 640 went into service.
Area codes nearest to 640
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
Overlay codes in the same area
ZIP codes in area code 640
54 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Trenton, NJ | 27 |
| Princeton, NJ | 5 |
| Allentown, NJ | 1 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 640 numbers
144 FCC complaints are on file for 141 numbers in 640, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 23 |
| 2024 | 38 |
| 2025 | 27 |
Other area codes in New Jersey
New Jersey is one state with 10 area codes in the NANPA table. 640 is one of them.
Next to 640 in the numbering table
These are the codes just before and after 640 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 640 was first assigned in New Jersey. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in New Jersey next to a 640 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 640
Where is area code 640?
NANPA assigns area code 640 to New Jersey, United States.
In which state does area code 640 sit?
New Jersey. 640 is one of 10 area codes the NANPA table assigns to the state.
Which places does area code 640 cover?
The places with the most ZIP codes among the rate centers in 640 are Trenton, NJ, Princeton, NJ and Allentown, NJ. The rate center list on this page shows all of them.
Who owns area code 640?
NANPA assigns area codes. Within 640, New Cingular Wireless PCS holds the most prefixes, 29 prefixes or 23%.
Which time zone does 640 use?
The NANPA NPA report lists the time zone for 640 as Eastern (E).
What year did 640 enter service?
The NANPA NPA report gives an in-service date of 2018-09-17, so 640 has been in use since 2018.
Does area code 640 have an overlay?
Yes. 609 (in service 1957-01-01) shares the same area with 640, so numbers from all of them are local to each other.
Which area codes are nearest to 640?
The area codes closest to 640, measured between the centers of the ZIP code places they serve, are 732 (about 29 miles), 848 (about 29 miles), 215 (about 33 miles), 267 (about 33 miles) and 856 (about 33 miles).
How many prefixes does area code 640 have?
NANPA's report dated 2026-10-17 lists 124 prefixes in service in 640, spread over 35 rate centers and 20 holders.
Are there complaints about 640 numbers?
The FCC data on file has 144 complaints for 141 numbers in 640. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.