Area code 640: New Jersey
Area code 640 is a US state area code for New Jersey, on Eastern Time. It has 124 prefixes in service across 35 rate centers, the largest being Atlantic City, Lawrenceville and Pleasantville. It shares its area with 609, so local numbers there can start with any of them. Local calls there take 10 digits.
Local time in area code 640
America/New_York
Prefixes in service
124 of 792 possible
35 rate centers
Area code 640 facts
| Location | New Jersey, United States |
|---|---|
| Time zone | Eastern Time |
| Overlays | 609 |
| Overlay of | 609 |
| In service since | September 17, 2018 |
| Local calls | 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
Which cities and towns use area code 640?
NANPA records each prefix against a rate center, the local billing area a number belongs to, usually named after its main town. These are the 640 rate centers with the most prefixes in service. 23 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Atlantic City | 16 |
| Lawrenceville | 16 |
| Pleasantville | 13 |
| Princeton | 7 |
| Trenton | 6 |
| Cranbury | 5 |
| Barnegat | 5 |
| Mount Holly | 4 |
| Allentown | 4 |
| New Egypt | 4 |
| Hammonton | 3 |
| Cape May Court House | 3 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 640 number?
NANPA's dialling plan for 640: local calls inside the code take 10 digits, toll calls 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 640 | 640-555-0147 |
|---|---|
| From another US or Canadian area code | 1-640-555-0147 |
| From outside North America | +1 640 555 0147 |
| E.164, for CRMs and SMS tools | +16405550147 |
When did area code 640 start?
Area code 640 went into service on September 17, 2018 as an overlay of 609. Today 640 and 609 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 640 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 640 number tells you where it was issued, not what it is now.
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Area code 640 questions
- What state is area code 640?
- Area code 640 is in New Jersey, United States. Its largest rate centers by number of prefixes are Atlantic City, Lawrenceville, Pleasantville, Princeton and Trenton.
- What time zone is area code 640 in?
- Eastern Time.
- What area codes overlay 640?
- 609. An overlay adds a new code to the same area instead of splitting it, so neighbours can have different area codes and local calls need 10 digits.
- When did area code 640 start?
- Area code 640 went into service on September 17, 2018 as an overlay of 609.
- Is a 640 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 640 have?
- 124 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
Other area codes in New Jersey
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.