Area code 640
Area code 640 serves Trenton and nearby parts of New Jersey, including Atlantic City, Princeton and Ocean City. It is on Eastern Time, which observes daylight saving time. 609 is an overlay for the same area.
Area code 640 at a glance
| State | New Jersey (NJ) |
| Main city | Trenton |
| Time zone | Eastern Time |
| UTC offset | UTC−5 in winter, UTC−4 in summer |
| Daylight saving time | Yes |
| Overlay codes | 609 |
Cities in 640
- Trenton
- Atlantic City
- Princeton
- Ocean City
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 640 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 640 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 640 between |
|---|---|
| Eastern | 8:00 AM to 9:00 PM |
| Central | 7:00 AM to 8:00 PM |
| Mountain | 6:00 AM to 7:00 PM |
| Arizona | 5:00 AM to 6:00 PM |
| Pacific | 5:00 AM to 6:00 PM |
See the time in 640 without leaving your CRM
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Other area codes in New Jersey
Questions about 640
What time zone is area code 640?
Area code 640 is on Eastern Time. It observes daylight saving time.
Where is area code 640?
Area code 640 is in New Jersey. Its main city is Trenton, and it also covers Atlantic City, Princeton and Ocean City.
What are the legal hours to call a 640 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.
What area codes overlay 640?
609 covers the same area as 640, so numbers in the same town can have either code.