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Area Code Overview
Area code 240 is a geographic telephone area code in Maryland that went into service on June 1, 1997. The geographic regions covered by this area code overlay has a population of approximately 1,658,076.
Overlay and Dialing Rules
- Area Code: 240
- State: Maryland
- Type: General Purpose Code
- In Service Date: June 1, 1997
- Overlay Complex: 227/240/301
- Local Dialing Plan: This area does require you to dial the area code when calling locally.
Estimated Number of Assigned Phone Numbers in Area Code 240
This area code is ranked 234th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 3rd out of 6.
3,820,000
Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 240
Wireless
1,436,000 assigned
37.59%
Wireline and VoIP
1,895,000 assigned
49.61%
Other / Unclassified
489,000 assigned
12.80%
Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 240
Estimated assigned wireless phone numbers: 1,436,000
Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.
T-Mobile 578,000 (40.25%)
AT&T Wireless 432,000 (30.08%)
Verizon Wireless 426,000 (29.67%)
Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 240
Estimated assigned wireline and VoIP phone numbers: 1,895,000
Bandwidth 299,000 (15.78%)
Comcast Business 126,000 (6.65%)
Peerless Network 112,000 (5.91%)
VERIZON MARYLAND, INC. 103,000 (5.44%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 76,000 (4.01%)
PAETEC ITEL, LLC 51,000 (2.69%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 38,000 (2.01%)
YMAX COMMUNICATIONS CORP. - MD 35,000 (1.85%)
Other / Unclassified Assigned Numbering in Area Code 240
Estimated assigned other or unclassified phone numbers: 489,000
CORE COMMUNICATIONS, INC.- MD 344,000 (70.35%)
TELEPORT COMMUNICATIONS AMERICA, LLC - MD 57,000 (11.66%)
TON80 COMMUNICATIONS, LLC 22,000 (4.50%)
IP HORIZON LLC 15,000 (3.07%)
USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD 12,000 (2.45%)
HD CARRIER LLC 10,000 (2.05%)
IDT AMERICA, CORP. - MD 10,000 (2.05%)
SHENTEL COMMUNICATIONS, LLC. - MD 5,000 (1.02%)
BARR TELL USA, INC. 4,000 (0.82%)
FRACTEL, LLC 4,000 (0.82%)
CORETEL MARYLAND, INC. - MD 2,000 (0.41%)
TELEPORT COMMUNICATIONS AMERICA, LLC - DC 2,000 (0.41%)
Cities and Towns in Area Code 240
Ashton, Maryland Baltimore, Maryland Bittinger, Maryland Brandywine, Maryland Brunswick, Maryland Buckeystown, Maryland Clear Spring, Maryland Cumberland, Maryland Damascus, Maryland Emmitsburg, Maryland Flintstone, Maryland Frederick, Maryland Friendsville, Maryland Frostburg, Maryland Gaithersburg, Maryland Grantsville, Maryland Hagerstown, Maryland Hancock, Maryland Highfield, Maryland Hughesville, Maryland Indian Head, Maryland Keedysville, Maryland Kitzmiller, Maryland La Plata, Maryland Laurel, Maryland Leonardtown, Maryland Lexington Park, Maryland Lonaconing, Maryland Mccoole, Maryland Mechanicsville, Maryland Middletown, Maryland Mount Airy, Maryland Mount Savage, Maryland Myersville, Maryland Nanjemoy, Maryland New Market, Maryland Oakland, Maryland Poolesville, Maryland Ridge, Maryland Smithsburg, Maryland Thurmont, Maryland Tompkinsville, Maryland Waldorf, Maryland Walkersville, Maryland Westernport, Maryland Williamsport, Maryland These geographic regions are also served by area codes 227 and 301.
How These Figures Were Built
These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 240, not live customer counts.
Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.
They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.
Population data and locality matching provided by GeoNames.
Last refreshed: April 15, 2026 6:22 pm