🇺🇸 United States · Maryland

Area code 240

Area code 240 is a telephone area code in Maryland, United States, covering Rockville, Frederick, Hagerstown, Gaithersburg, Cumberland, Laurel and more. Local time is UTC−5 (UTC−4 in summer). Numbers look like (240) 234-5678, or +1 240 234 5678 from abroad.

State: Maryland
Time zone: New York UTC−5 (UTC−4 in summer)
Local time now: –
Dial from abroad: +1 240

Places in area code 240

Cities and towns with telephone exchanges in the 240 area code, most exchanges first.

Rockville
Frederick
Hagerstown
Gaithersburg
Cumberland
Laurel
Germantown
Joint Base Andrews Naval Air Facility

How to dial area code 240

Calling from	You dial
Inside the 240 area	240 234 5678 (10 digits)
Elsewhere in the US & Canada	1 240 234 5678
Any mobile phone, anywhere	+1 240 234 5678
UK, Europe, India and most countries	00 1 240 234 5678
Australia	0011 1 240 234 5678

Other area codes in Maryland

227 Maryland 301 Bethesda, Silver Spring 410 Baltimore, Annapolis 443 Baltimore, Annapolis 667 Maryland

Area code 240: FAQ

Where is area code 240?

Area code 240 is in Maryland, United States and serves Rockville, Frederick, Hagerstown, Gaithersburg, Cumberland, Laurel. and other places

What time zone is area code 240 in?

Area code 240 is in the America/New_York time zone (UTC−5 (UTC−4 in summer)).

How do I call a 240 number from outside the US and Canada?

Dial your exit code (00 in most countries, or + on a mobile), then 1, then 240 and the seven-digit number. Example: +1 240 234 5678.

Is a call from area code 240 a scam?

Area code 240 is a regular North American area code, but caller ID can be spoofed: scammers often show local-looking numbers. Do not call back unknown numbers that ask for money or personal data, and check the number with the phone number validator to see whether it is valid and whether it is a mobile, landline or VoIP number.

Phone number API

Check 240 numbers in your app

numlookupapi checks any phone number worldwide in one request and returns validity, line type, carrier, location and every standard format as JSON.

Read the documentation

100 free requests every month. No credit card required.

GET https://api.numlookupapi.com/v1/validate/+12402345678

{
  "valid": true,
  "number": "12069220880",
  "local_format": "2069220880",
  "international_format": "+12069220880",
  "country_prefix": "+1",
  "country_code": "US",
  "country_name": "United States of America",
  "location": "Seattle",
  "line_type": "landline",
  "e164_format": "+12069220880",
  "national_format": "(206) 922-0880"
}