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Area Code Overview
Area code 301 is a geographic telephone area code in Maryland that went into service on January 1, 1947. The geographic regions covered by this area code overlay has a population of approximately 1,658,076.
Overlay and Dialing Rules
- Area Code: 301
- State: Maryland
- Type: General Purpose Code
- In Service Date: January 1, 1947
- 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 301
This area code is ranked 284th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 5th out of 6.
2,155,000
Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 301
Wireline and VoIP
1,330,000 assigned
61.72%
Other / Unclassified
188,000 assigned
8.72%
Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 301
Estimated assigned wireless phone numbers: 637,000
Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.
Verizon Wireless 248,000 (38.93%)
T-Mobile 216,000 (33.91%)
AT&T Wireless 172,000 (27.00%)
Optimum Mobile 1,000 (0.16%)
Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 301
Estimated assigned wireline and VoIP phone numbers: 1,330,000
VERIZON MARYLAND, INC. 802,000 (60.30%)
Bandwidth 176,000 (13.23%)
Comcast Business 55,000 (4.14%)
PAETEC ITEL, LLC 45,000 (3.38%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 20,000 (1.50%)
YMAX COMMUNICATIONS CORP. - MD 20,000 (1.50%)
Peerless Network 16,000 (1.20%)
BALTIMORE-WASHINGTON TELEPHONE (BWT) 8,000 (0.60%)
Other / Unclassified Assigned Numbering in Area Code 301
Estimated assigned other or unclassified phone numbers: 188,000
CORE COMMUNICATIONS, INC.- MD 99,000 (52.66%)
USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD 48,000 (25.53%)
SPOK, INC. 10,000 (5.32%)
IP HORIZON LLC 9,000 (4.79%)
TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7,000 (3.72%)
IDT AMERICA, CORP. - MD 6,000 (3.19%)
VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 4,000 (2.13%)
SHENTEL COMMUNICATIONS, LLC. - MD 2,000 (1.06%)
TELEPORT COMMUNICATIONS AMERICA, LLC - DC 2,000 (1.06%)
MOUNTAIN COMMUNICATIONS, LLC DBA PROCOM - MD 1,000 (0.53%)
Cities and Towns in Area Code 301
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 240.
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 301, 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