Area Code Overview

Area code 667 is a geographic telephone area code in Maryland that went into service on March 24, 2012. The geographic regions covered by this area code overlay has a population of approximately 1,797,325.

Overlay and Dialing Rules

Area Code: 667
State: Maryland
Type: General Purpose Code
In Service Date: March 24, 2012
Overlay Complex: 410/443/667
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 667

This area code is ranked 235th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 4th out of 6.

3,801,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 667

Total assigned 3,801,000

Wireless

1,349,000 assigned

35.49%

Wireline and VoIP

1,817,000 assigned

47.80%

Other / Unclassified

635,000 assigned

16.71%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 667

Estimated assigned wireless phone numbers: 1,349,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

AT&T Wireless 650,000 (48.18%)

T-Mobile 573,000 (42.48%)

Verizon Wireless 123,000 (9.12%)

Optimum Mobile 2,000 (0.15%)

EVOLVE CELLULAR, INC. 1,000 (0.07%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 667

Estimated assigned wireline and VoIP phone numbers: 1,817,000

Onvoy 809,000 (44.52%)

Spectrum 261,000 (14.36%)

Bandwidth 174,000 (9.58%)

Lumen 97,000 (5.34%)

Commio 89,000 (4.90%)

Peerless Network 73,000 (4.02%)

Comcast Business 52,000 (2.86%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 45,000 (2.48%)

Telnyx 41,000 (2.26%)

NUSO 39,000 (2.15%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 27,000 (1.49%)

PAETEC ITEL, LLC 27,000 (1.49%)

Other / Unclassified Assigned Numbering in Area Code 667

Estimated assigned other or unclassified phone numbers: 635,000

CORE COMMUNICATIONS, INC.- MD 411,000 (64.72%)

TELEPORT COMMUNICATIONS AMERICA, LLC - MD 93,000 (14.65%)

TON80 COMMUNICATIONS, LLC 49,000 (7.72%)

IP HORIZON LLC 26,000 (4.09%)

HD CARRIER LLC 23,000 (3.62%)

BARR TELL USA, INC. 9,000 (1.42%)

FRACTEL, LLC 8,000 (1.26%)

CORETEL MARYLAND, INC. - MD 3,000 (0.47%)

ATLANTECH ONLINE, INC. - MD 2,000 (0.32%)

CALLWORKS CORPORATION 2,000 (0.32%)

EXIANT COMMUNICATIONS LLC 2,000 (0.32%)

FIVE9, INC. 2,000 (0.32%)

Cities and Towns in Area Code 667

Aberdeen, Maryland Annapolis, Maryland Arbutus, Maryland Baltimore, Maryland Bel Air, Maryland Berlin, Maryland Bishopville, Maryland Brooklyn Park, Maryland Cambridge, Maryland Cardiff, Maryland Catonsville, Maryland Cecilton, Maryland Centreville, Maryland Chase, Maryland Chesapeake City, Maryland Chestertown, Maryland Church Hill, Maryland Churchville, Maryland Cockeysville, Maryland Columbia, Maryland Crisfield, Maryland Crofton, Maryland Darlington, Maryland Deal Island, Maryland Delmar, Maryland Denton, Maryland Dundalk, Maryland Easton, Maryland Edgewood, Maryland Elkridge, Maryland Elkton, Maryland Ellicott City, Maryland Essex, Maryland Fallston, Maryland Federalsburg, Maryland Galena, Maryland Gibson Island, Maryland Glen Burnie, Maryland Glenwood, Maryland Greensboro, Maryland Hampstead, Maryland Havre de Grace, Maryland Hillsboro, Maryland Hurlock, Maryland Jarrettsville, Maryland Marion, Maryland Millersville, Maryland Millington, Maryland Nanticoke, Maryland New Windsor, Maryland North Beach, Maryland North East, Maryland Ocean City, Maryland Odenton, Maryland Oxford, Maryland Parkton, Maryland Parkville, Maryland Perryville, Maryland Pikesville, Maryland Pocomoke City, Maryland Port Deposit, Maryland Preston, Maryland Prince Frederick, Maryland Princess Anne, Maryland Queenstown, Maryland Randallstown, Maryland Reisterstown, Maryland Ridgely, Maryland Rising Sun, Maryland Rock Hall, Maryland Saint Michaels, Maryland Salisbury, Maryland Severn, Maryland Severna Park, Maryland Sharptown, Maryland Sherwood Forest, Maryland Silver Run, Maryland Smith, Maryland Snow Hill, Maryland Solomons, Maryland Sparks Glencoe, Maryland Sparrows Point, Maryland Stevensville, Maryland Still Pond, Maryland Sudlersville, Maryland Sykesville, Maryland Taneytown, Maryland Tilghman, Maryland Towson, Maryland Trappe, Maryland Union Bridge, Maryland Vienna, Maryland Warwick, Maryland Waterloo, Maryland West River, Maryland Westminster, Maryland Willards, Maryland Wingate, Maryland Woodlawn, Maryland Worthington, Maryland

These geographic regions are also served by area codes 410 and 443.

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 667, 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