What time zone is area code 240 in?

Area code 240 uses Eastern Time.

What area codes overlay 240?

227 and 301 serve the same area as 240. New numbers in the area can get any of these codes, which is why local calls need all 10 digits.

Is a call from area code 240 a scam?

The area code alone doesn’t tell you. Most calls from 240 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 240 number, let it go to voicemail.

When did area code 240 start?

240 went into service in 1997. It was created from area code 301.

Can a 240 number be outside Maryland?

Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 240 caller can be anywhere.

Area code 240

Where is area code 240?

Silver Spring, Rockville and Bethesda, Maryland

Local time: … (Eastern Time)

State	Maryland
Country	United States
Main cities	Silver Spring, Rockville and Bethesda
Time zone	Eastern Time
Overlay area codes	227 and 301
In service since	1997 (created from 301)
Assigned prefixes	785
Dialing format	(240) XXX-XXXX · +1 240 XXX XXXX from abroad

Look up a 240 number

Cities and towns in area code 240

Listed by how many phone prefixes (the 3 digits after the area code) are assigned to each place in 240.

Silver Spring, MD (83)
Rockville, MD (71)
Bethesda, MD (64)
Frederick, MD (43)
Gaithersburg, MD (39)
Laurel, MD (39)
Hagerstown, MD (33)
Lanham, MD (30)
Temple Hills, MD (27)
Waldorf, MD (26)
Olney, MD (25)
Beltsville, MD (18)
Leonardtown, MD (17)
Columbia, MD (16)
Cumberland, MD (16)
Bowie, MD (14)
Oxon Hill, MD (13)
California, MD (12)
Clinton, MD (11)
Myersville, MD (11)
Damascus, MD (9)
Hughesville, MD (9)
Brandywine, MD (8)
La Plata, MD (8)
Upper Marlboro, MD (8)
Mechanicsville, MD (7)
Bryans Road, MD (6)
Newburg, MD (6)
Oakland, MD (6)
Poolesville, MD (6)
Ridge, MD (6)
Ashton238, MD (5)
Buckeystn, MD (5)
Mount Airy, MD (5)
Nanjemoy, MD (5)
Damascs240, MD (4)
Frostburg, MD (4)
Hancock, MD (4)
Highfield, MD (4)
Middletown, MD (4)
Wsng238z13, MD (4)
Wsng238z14, MD (4)
Clear Spring, MD (3)
Emmitsburg, MD (3)
Grantsville, MD (3)
Keedysvl, MD (3)
McCoole, MD (3)
New Market, MD (3)
Smithsburg, MD (3)
Thurmont, MD (3)
Walkersville, MD (3)
Williamsport, MD (3)
Bittinger, MD (2)
Brunswick, MD (2)
Flintstone, MD (2)
Friendsvl, MD (2)
Kitzmiller, MD (2)
Lonaconing, MD (2)
Mt Savage, MD (2)
Westernport, MD (2)
Wsng238z15, MD (2)
Germantown, MD (1)
Joint Base Andrews Naval Air Facility, MD (1)

Phone companies in area code 240

The carriers that hold the most 240 prefixes. People can move their number to another carrier, so this shows who first issued a number, not who serves it today.

Prefixes	Carrier
117	Omnipoint Communications Cap Operations (T-Mobile)
85	Verizon Wireless
69	New Cingular Wireless PCS (AT&T)
63	Paetec Itel
59	Level 3 Communications
56	Onvoy
49	Mcimetro Access Transmission Services
48	Verizon Maryland

All 785 prefixes in area code 240

Pick the 3 digits after the area code to see that prefix’s city and carrier.

Area codes that overlay 240

Questions

Where is area code 240?: Area code 240 is in Maryland. It serves Silver Spring, Rockville, Bethesda, Frederick and Gaithersburg and 58 other cities and towns.
What time zone is area code 240 in?: Area code 240 uses Eastern Time.
What area codes overlay 240?: 227 and 301 serve the same area as 240. New numbers in the area can get any of these codes, which is why local calls need all 10 digits.
Is a call from area code 240 a scam?: The area code alone doesn’t tell you. Most calls from 240 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 240 number, let it go to voicemail.
When did area code 240 start?: 240 went into service in 1997. It was created from area code 301.
Can a 240 number be outside Maryland?: Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 240 caller can be anywhere.

Other area codes in Maryland

Area code	Main cities
410	Baltimore, Annapolis and Towson
443	Baltimore, Annapolis and Towson
667	Baltimore, Owings Mills and Aberdeen