240 Area Code
Rockville, MD and 8 other locations · United States
Country code +1 · ISO US
Example 240 Number
A sample number from this area code, formatted three ways.
| National | International | E.164 |
|---|---|---|
| (240) 555-0123 | +1 240-555-0123 | +12405550123 |
Try it now
Pre-filled with a 240 sample number. Edit it and click "Try It" to see the parsed result.
Cities and Regions
Locations served by the 240 area code, according to Google's libphonenumber.
- · Rockville, MD
- · Frederick, MD
- · Hagerstown, MD
- · Gaithersburg, MD
- · Maryland
- · Cumberland, MD
- · Laurel, MD
- · Germantown, MD
- · Joint Base Andrews Naval Air Facility, MD
How to Dial United States Numbers
From abroad
Dial +1 followed by the national number, dropping any leading 1.
Within United States
Dial 1 before the local number to make a domestic call.
Dialing out of United States
Dial 011 followed by the destination country code and number.
Nearby United States Area Codes
Frequently Asked Questions
Where is the 240 area code?
└ The 240 area code covers Rockville, MD in United States.
What timezone is the 240 area code in?
└ Numbers in the 240 area code are in the America/New_York timezone.
How do I dial a 240 number?
└ From abroad, dial +1 240 followed by the local number. Within United States, dial 1240 before the local number.