Area Code 840 at a Glance
| Area code | 840 |
| Region | California |
| Country | United States |
| Primary timezone | America/Los_Angeles |
| Dialing format | +1 (840) NXX-XXXX |
Frequently Asked Questions
Where is area code 840?
Area code 840 serves California, United States.
Who is calling me from area code 840?
A call from area code 840 most likely originates from California, but caller ID can be spoofed. If an unknown caller asks for personal or payment information, hang up and call the organization back on its official number.
How do I dial a 840 number?
Within North America: dial 1-840 followed by the 7-digit number. From abroad: your international prefix (like 00 or +), then 1 840 and the number.