Question 1

Where is area code 240?

Accepted Answer

Area code 240 covers Washington and nearby cities including Frederick, Gaithersburg, Rockville in Maryland, in the Eastern Time.

Question 2

What cities use area code 240?

Accepted Answer

Area code 240 serves Washington, Frederick, Gaithersburg, Rockville, Bowie, and 22 other communities in Maryland.

Question 3

What time zone is area code 240 in?

Accepted Answer

Area code 240 is in the Eastern Time (America/New_York).

Question 4

How do you dial a 240 number?

Accepted Answer

Dial all 10 digits: 240 followed by the 7-digit local number. From abroad, dial +1 240 and the local number.

Question 5

Is a call from area code 240 a scam?

Accepted Answer

A 240 number is geographically tied to Maryland, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.

Question 6

Is 240 a country code?

Accepted Answer

No. 240 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 240 number written for international dialing looks like +1 240 followed by the 7-digit local number.

Area Code 240

Cities in area code 240

Area codes by city

Carriers in area code 240

Other Maryland area codes

Nearby area codes