Area Code 240 at a Glance
| Area code | 240 |
| Region | Maryland |
| Country | United States |
| Primary timezone | America/New_York |
| Dialing format | +1 (240) NXX-XXXX |
Cities and Places Using Area Code 240
Based on prefix-level carrier data, area code 240 covers places including:
- Frederick, MD
- Rockville, MD
- Hagerstown, MD
- Gaithersburg, MD
- Germantown, MD
- Joint Base Andrews Naval Air Facility, MD
- Cumberland, MD
- Laurel, MD
Frequently Asked Questions
Where is area code 240?
Area code 240 serves Maryland, United States.
Who is calling me from area code 240?
A call from area code 240 most likely originates from Maryland, 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 240 number?
Within North America: dial 1-240 followed by the 7-digit number. From abroad: your international prefix (like 00 or +), then 1 240 and the number.