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+1 443 area code (Maryland): Baltimore, Annapolis, Towson

What the numbering plan and the regulator's allocation table say about numbers starting +1 443: the place, the line types, every block's status and the carriers those blocks were allocated to. Original allocation, not who serves a number today, and never who owns or calls from a number.

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The range at a glance

CountryUnited States (US)
Calling code+1
Prefix443
Place named for the rangeMaryland
Rate centres with most codes (NANPA)Baltimore, Annapolis, Towson
Time zonesAmerica/New_York (Eastern Standard Time, UTC−5, UTC−4 in daylight saving time)
Line types by the numbering planfixed_line_or_mobile
Example format+1 443-200-0000

+1 443 in NANPA’s area code report

+1 443 is a North American area code for Maryland, in service since 1 June 1997, sharing its area with 410, 667, per NANPA’s NPA report of 20 October 2026. NANPA names 410 as the code it came from: the 3 codes of the overlay serve one area, so a new number there can get any of them.

Shares its area with 410, 667 (an overlay complex)
State, province or territoryMaryland
In service since1 June 1997
Local calls dialled as10 digits (1 + 10 digits also allowed)
NANPA’s dialling note1+10 digit permissible at service provider discretion.
Time zones (NANPA)Eastern
Relief planningnone under way

Rate centres with the most allocated codes (NANPA)

Each central office code is assigned for a rate centre, the regulator’s billing area for it, named after a town or exchange. It is not where a subscriber is: mobile and VoIP numbers are used anywhere, and a ported number keeps its rate centre. The 785 assigned codes in 443 are spread over 81 rate centres.

named after rate centres codes
Baltimore1185
Annapolis139
Towson133
Columbia131
Glen Burnie126
Catonsville122
Pikesville121
Salisbury120
Bel Air119
Aberdeen115
Westminster115
Cockeysville114
68 more with fewer codes
  • Elkton (14)
  • Essex (14)
  • Parkville (14)
  • Waterloo (14)
  • Woodlawn (13)
  • Arbutus (10)
  • Dundalk (10)
  • Fallston (10)
  • Severna Park (10)
  • Easton (9)
  • Edgewood (9)
  • Elkridge (9)
  • Ellicott City (9)
  • Prince Frederick (9)
  • Randallstown (9)
  • Severn (9)
  • Sykesville (9)
  • Armiger-Gibson Island (8)
  • Reisterstown (8)
  • Brooklyn Park Linthicum (7)
  • Cambridge (7)
  • Chase (6)
  • Sparrows Point (6)
  • Fork (5)
  • Hampstead (5)
  • North East (5)
  • Odenton (5)
  • Cardiff (4)
  • Chestertown (4)
  • Churchville (4)
  • Crofton (4)
  • Delmar (4)
  • Havre de Grace (4)
  • Jarrettsville (4)
  • Millersville (4)
  • North Beach (4)
  • Perryville (4)
  • Sparks Glencoe (4)
  • West River (4)
  • Worthington (4)
  • Glenwood (3)
  • New Windsor (3)
  • Ocean City (3)
  • Parkton (3)
  • Port Deposit (3)
  • Silver Run (3)
  • Taneytown (3)
  • Berlin (2)
  • Centreville (2)
  • Darlington (2)
  • Pocomoke (2)
  • Princess Anne (2)
  • Sherwood Forest (2)
  • Solomons (2)
  • Union Bridge (2)
  • Bishopville (1)
  • Chesapeake City (1)
  • Crisfield (1)
  • Denton (1)
  • Federalsburg (1)
  • Nanticoke (1)
  • Queenstown (1)
  • Sharptown (1)
  • Snow Hill (1)
  • Stevensville (1)
  • Trappe (1)
  • Vienna (1)
  • Willards (1)

Codes assigned in the last 12 months, and codes not yet in service

NANPA’s central office code file of 20 October 2026 lists 0 codes in 443 assigned in the 12 months to 20 October 2026, and 54 thousands-blocks inside its pooled codes. Not yet in service: 9 thousands-blocks. NANPA dates codes from 2001 on only: 299 of the 785 codes carry a date, so an undated code is not a new one. A code not yet in service is waiting for its effective date; a reassigned block can hold numbers used before. Original allocation, not who serves a number today.

Blocks in the regulator's table

Each block is a 6-digit prefix of the national number. A number in an allocated block is assignable; in an unassigned block no carrier can have a subscriber, so the lookup answers unassigned_block for it, except a number in a range reserved for fiction (is_fictional), which answers valid even where the regulator lists its block as protected. Of the allocated blocks, 39.7% belong to a wireless carrier, 4.8% to a virtual-number wholesaler or VoIP provider, and 55.4% to a holder whose name settles neither.

Allocated785
Unassigned0
Reserved15
Total blocks800

Who the blocks were allocated to

The holders as the regulator lists them, by number of allocated blocks. Allocation is not service: a ported number keeps its original block, so a holder here may no longer serve a given number. The last row adds up every other allocated block in the table: the smaller holders and any holder this page does not name. 701 of these codes are pooled into thousands-blocks, which carriers other than the code holder can hold. This page counts codes; a lookup of a US number names the holder of the number's own thousands-block where NANPA lists it.

holderkind blocks share
PAETEC ITEL, LLCunsettled15319.5%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MDmobile12115.4%
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLCmobile9412.0%
NEW CINGULAR WIRELESS PCS, LLC - DCmobile719.0%
LEVEL 3 COMMUNICATIONS, LLC - MDunsettled698.8%
VERIZON MARYLAND, INC.unsettled557.0%
TELEPORT COMMUNICATIONS AMERICA, LLC - MDunsettled486.1%
MCIMETRO ACCESS TRANSMISSION SERVICES LLCunsettled465.9%
CORE COMMUNICATIONS, INC.- MDunsettled344.3%
METROPCS, INC.mobile253.2%
All other blocks (16 holders not listed) — 698.8%

What each network brand’s legal entities hold across the whole table, counted in numbers: Verizon, Windstream, AT&T, T-Mobile, Lumen, Bandwidth, Inteliquent, Comcast, Peerless Network, Telnyx.

All 785 assigned central office codes in 443

Each row is a central office code (the three digits after the area code) as NANPA’s central office code file lists it: the rate centre it is assigned for, the network brand of the code holder where the brand map knows one, and the date it was assigned where the file gives one. Original allocation, not who serves a number today: a ported number keeps its code, and in a pooled code the blocks of a thousand can be held by carriers other than the code holder. There is no page per code.

show all 785 codes
coderate centrecode holder’s brandassignednote
443-200WoodlawnVerizon2001-02-21pooled
443-201WestminsterAT&T—pooled
443-202BaltimoreVerizon2012-01-09pooled
443-203West RiverVerizon—pooled
443-204PikesvilleAT&T2003-05-15pooled
443-205CambridgeVerizon—pooled
443-206PerryvilleVerizon—pooled
443-207ElktonT-Mobile—pooled
443-208BaltimoreT-Mobile2011-02-01pooled
443-209Havre de GraceWindstream—pooled
443-210SalisburyT-Mobile2011-09-30pooled
443-212Sparks GlencoeWindstream—pooled
443-213PikesvilleVerizon—pooled
443-214AnnapolisAT&T2011-10-11pooled
443-215Chestertown——
443-216DundalkWindstream—pooled
443-217Annapolis——
443-218WorthingtonLumen—pooled
443-219ParkvilleLumen—pooled
443-220BaltimoreVerizon—pooled
443-221AnnapolisLumen—pooled
443-222WorthingtonInteliquent—pooled
443-223AnnapolisVerizon—
443-224BaltimoreVerizon—pooled
443-225CambridgeT-Mobile2004-01-20pooled
443-226BaltimoreT-Mobile—pooled
443-227Port DepositWindstream—pooled
443-228ChaseWindstream—pooled
443-229Severna ParkWindstream2001-05-10pooled
443-230OdentonWindstream—pooled
443-231EssexAT&T—pooled
443-232Willards——pooled
443-233ViennaWindstream—pooled
443-234Snow HillWindstream—pooled
443-235SalisburyVerizon—
443-236Cardiff——
443-237North Beach——
443-238ParktonWindstream—pooled
443-239EastonAT&T2004-01-20pooled
443-240BaltimoreAT&T2012-01-27pooled
443-241WestminsterInteliquent—
443-242Sparrows PointWindstream2001-05-10pooled
443-243FallstonVerizon—
443-244WestminsterLumen—pooled
443-245ElktonWindstream—pooled
443-246Elkton——
443-247Union BridgeWindstream—pooled
443-248BaltimoreVerizon2007-01-15pooled
443-249StevensvilleVerizon—pooled
443-250BaltimoreT-Mobile—pooled
443-251CatonsvilleInteliquent—pooled
443-252PerryvilleVerizon2009-09-08pooled
443-253BaltimoreAT&T—
443-254AnnapolisT-Mobile—
443-255BaltimoreAT&T—
443-256North EastWindstream—pooled
443-257BaltimoreVerizon—pooled
443-258EastonAT&T—pooled
443-259ColumbiaVerizon—pooled
443-260SalisburyVerizon—pooled
443-261Severna ParkVerizon—pooled
443-262CentrevilleVerizon—pooled
443-263BaltimoreVerizon—
443-264Pikesville——pooled
443-265ForkWindstream2001-05-10pooled
443-266GlenwoodBandwidth—pooled
443-267DarlingtonAT&T—pooled
443-268Baltimore——
443-269Towson——pooled
443-270Glen BurnieWindstream—
443-271BaltimoreT-Mobile2002-10-21pooled
443-272RandallstownAT&T—pooled
443-273ReisterstownAT&T—pooled
443-274SevernVerizon—pooled
443-275TowsonComcast—pooled
443-276ColumbiaVerizon—pooled
443-277SykesvilleT-Mobile—pooled
443-278Baltimore—2003-10-02pooled
443-279TowsonVerizon—pooled
443-280SykesvilleAT&T—pooled
443-281CockeysvilleVerizon—pooled
443-282ChestertownT-Mobile2004-10-04pooled
443-283ColumbiaWindstream—
443-284Waterloo——pooled
443-285ColumbiaVerizon—pooled
443-286BaltimoreVerizon—
443-287BaltimoreVerizon—
443-288Ellicott CityVerizon—pooled
443-289WestminsterVerizon2011-05-16pooled
443-290ParkvilleLumen—pooled
443-291HampsteadLumen—pooled
443-292CroftonLumen—pooled
443-293WestminsterVerizon—pooled
443-294West RiverBandwidth—pooled
443-295Prince FrederickLumen—pooled
443-296WaterlooLumen—pooled
443-297ArbutusAT&T—pooled
443-298EastonAT&T2002-11-15pooled
443-299FallstonVerizon—pooled
443-300SykesvilleLumen—pooled
443-301BaltimoreAT&T2012-04-05pooled
443-302CroftonLumen—pooled
443-303AberdeenLumen—pooled
443-304ArbutusBandwidth—pooled
443-305Armiger-Gibson IslandLumen—pooled
443-306Severna ParkT-Mobile—pooled
443-307Bel AirLumen—pooled
443-308SevernVerizon—pooled
443-309ElktonT-Mobile—pooled
443-310BaltimoreAT&T—
443-312Brooklyn Park LinthicumLumen—pooled
443-313ForkLumen—pooled
443-314BaltimoreT-Mobile2011-02-01pooled
443-315CatonsvilleAT&T—pooled
443-316WoodlawnLumen—pooled
443-317ChaseBandwidth—pooled
443-318CockeysvilleWindstream—pooled
443-319ColumbiaWindstream—pooled
443-320BaltimoreLumen—pooled
443-321AnnapolisWindstream—
443-322TowsonWindstream2001-05-10pooled
443-323SharptownWindstream—pooled
443-324BaltimoreT-Mobile—pooled
443-325Ellicott CityWindstream—pooled
443-326BaltimoreAT&T2001-02-21
443-327AberdeenWindstream—pooled
443-328SykesvilleWindstream—pooled
443-329WaterlooLumen—pooled
443-330CockeysvilleWindstream—pooled
443-331TaneytownWindstream—pooled
443-332CroftonWindstream2001-05-09pooled
443-333AnnapolisAT&T2009-02-13pooled
443-334PikesvilleVerizon2001-03-14pooled
443-335Brooklyn Park LinthicumT-Mobile—pooled
443-336AnnapolisT-Mobile—pooled
443-337Sparrows Point——pooled
443-338Sparks GlencoeWindstream—pooled
443-339Sherwood ForestWindstream—pooled
443-340WestminsterVerizon—
443-341CatonsvilleLumen—pooled
443-342SolomonsWindstream—pooled
443-343MillersvilleAT&T—pooled
443-344Severna Park——
443-345AberdeenLumen—pooled
443-346Severna Park——pooled
443-347CardiffWindstream—pooled
443-348WoodlawnAT&T—pooled
443-349Silver Run——
443-350ElktonVerizon—pooled
443-351OdentonWindstream—pooled
443-352PikesvilleLumen—pooled
443-353CockeysvilleVerizon2004-03-19pooled
443-354Glen BurnieLumen—pooled
443-355Ellicott CityLumen—pooled
443-356Bel AirLumen—pooled
443-357PikesvilleVerizon—pooled
443-358Salisbury—2011-02-17pooled
443-359DelmarVerizon—pooled
443-360AberdeenAT&T—pooled
443-361Sykesville——
443-362EastonT-Mobile—pooled
443-363Severn——pooled
443-364Ellicott CityAT&T—pooled
443-365SalisburyT-Mobile—pooled
443-366SalisburyT-Mobile2001-04-17pooled
443-367ColumbiaVerizon—pooled
443-368Westminster——
443-369Bel Air——
443-370AnnapolisAT&T—pooled
443-371Bel AirLumen—pooled
443-372EdgewoodWindstream2001-03-19pooled
443-373Ocean CityT-Mobile—pooled
443-374AberdeenWindstream—pooled
443-375HampsteadT-Mobile—pooled
443-376DundalkAT&T—pooled
443-377TowsonVerizon2010-06-09pooled
443-378BaltimoreT-Mobile2004-07-27pooled
443-379PikesvilleComcast2007-02-23pooled
443-380WoodlawnLumen—pooled
443-381ReisterstownAT&T—pooled
443-382Cambridge——
443-383Silver RunWindstream—pooled
443-384ParkvilleWindstream—pooled
443-385Easton——
443-386BaltimoreVerizon—pooled
443-387Pocomoke——
443-388BaltimoreVerizon2006-04-13pooled
443-389Salisbury——
443-390ChurchvilleBandwidth—pooled
443-391CockeysvilleLumen—pooled
443-392BaltimoreAT&T—pooled
443-393ColumbiaLumen—pooled
443-394PikesvilleVerizon—
443-395AberdeenVerizon2009-08-13pooled
443-396OdentonLumen—pooled
443-397SalisburyVerizon2009-04-06pooled
443-398SykesvilleT-Mobile2001-03-15pooled
443-399DundalkInteliquent—pooled
443-400Brooklyn Park LinthicumVerizon—pooled
443-401BaltimoreVerizon2011-10-17pooled
443-402EdgewoodAT&T—pooled
443-403AberdeenLumen2001-06-20pooled
443-404SolomonsT-Mobile—pooled
443-405RandallstownComcast—pooled
443-406ElktonAT&T—pooled
443-407DundalkVerizon—pooled
443-408Sparrows PointVerizon—pooled
443-409EdgewoodWindstream—pooled
443-410Glen BurnieLumen2013-06-21pooled
443-412ChurchvilleAT&T—pooled
443-413BaltimoreT-Mobile—pooled
443-414BaltimoreT-Mobile—pooled
443-415BaltimoreT-Mobile—pooled
443-416BaltimoreT-Mobile—pooled
443-417FallstonAT&T—pooled
443-418BaltimoreT-Mobile—pooled
443-419GlenwoodWindstream—pooled
443-420Ellicott CityBandwidth—pooled
443-421ForkAT&T—
443-422Glen BurnieAT&T2009-02-13pooled
443-423BaltimoreLumen—pooled
443-424CardiffAT&T—pooled
443-425ParkvilleAT&T—pooled
443-426RandallstownWindstream—pooled
443-427Princess Anne——
443-428Cockeysville——
443-429WoodlawnWindstream—pooled
443-430ColumbiaVerizon2001-05-18pooled
443-431Randallstown——pooled
443-432Prince FrederickWindstream—pooled
443-433AnnapolisVerizon2001-02-21pooled
443-434FederalsburgTelnyx—pooled
443-435BaltimoreT-Mobile2011-02-01pooled
443-436WoodlawnVerizon—pooled
443-437PocomokeAT&T2004-11-01pooled
443-438BaltimoreVerizon2008-10-08pooled
443-439TrappeVerizon2004-11-01pooled
443-440AnnapolisVerizon—pooled
443-441GlenwoodAT&T—pooled
443-442ParkvilleWindstream2001-05-09pooled
443-443ArbutusCommio2023-11-21pooled
443-444BaltimoreVerizon—pooled
443-445ElkridgeVerizon—pooled
443-446QueenstownVerizon2004-11-01pooled
443-447BaltimoreAT&T2008-12-15pooled
443-448DentonComcast2004-11-01pooled
443-449BaltimoreWindstream2007-03-28pooled
443-450PikesvilleLumen—pooled
443-451BaltimoreWindstream—
443-452BaltimoreWindstream2005-09-07pooled
443-453BaltimoreInteliquent2007-10-12pooled
443-454AnnapolisT-Mobile—pooled
443-455BaltimoreVerizon2006-03-09pooled
443-456EdgewoodComcast—pooled
443-457Brooklyn Park LinthicumAT&T—pooled
443-458AnnapolisVerizon—pooled
443-459ElkridgeWindstream—pooled
443-460EssexVerizon—pooled
443-461ParkvilleWindstream—pooled
443-462BaltimoreVerizon2008-11-06pooled
443-463BaltimoreT-Mobile—pooled
443-464ChurchvilleWindstream2010-03-16pooled
443-465TowsonVerizon—pooled
443-466ElktonT-Mobile—pooled
443-467BaltimoreAT&T2009-03-20pooled
443-468BaltimoreT-Mobile2007-04-04pooled
443-469BaltimoreAT&T2009-03-20pooled
443-470TowsonWindstream2008-04-29pooled
443-471PikesvilleWindstream—pooled
443-472ColumbiaLumen—pooled
443-473BaltimoreT-Mobile2007-03-28pooled
443-474CatonsvilleAT&T—
443-475BaltimoreVerizon2011-06-01pooled
443-476AnnapolisVerizon—
443-477CambridgeVerizon2007-01-13pooled
443-478BaltimoreVerizon2009-03-06pooled
443-479WaterlooVerizon—
443-480ChestertownVerizon—pooled
443-481AnnapolisWindstream—pooled
443-482AnnapolisVerizon—pooled
443-483CardiffLumen—pooled
443-484EdgewoodLumen—pooled
443-485ElktonLumen—pooled
443-486Prince FrederickLumen—pooled
443-487WestminsterLumen—pooled
443-488BaltimoreAT&T2010-06-23pooled
443-489ChaseAT&T—pooled
443-490EdgewoodBandwidth—pooled
443-491ParktonInteliquent—pooled
443-492ElkridgeLumen—pooled
443-493DelmarVerizon2009-03-06pooled
443-494MillersvilleBandwidth—pooled
443-495ParkvilleBandwidth—pooled
443-496EastonT-Mobile—pooled
443-497SalisburyT-Mobile—pooled
443-498CatonsvilleVerizon—pooled
443-499JarrettsvilleBandwidth—pooled
443-500BaltimoreAT&T2009-03-20pooled
443-501PikesvilleLumen—pooled
443-502Havre de GraceAT&T—pooled
443-503DundalkVerizon—pooled
443-504FallstonWindstream—pooled
443-505EssexLumen—pooled
443-506BaltimoreT-Mobile—pooled
443-507HampsteadAT&T—pooled
443-508HampsteadWindstream—pooled
443-509BaltimoreVerizon2009-02-10pooled
443-510AnnapolisVerizon2007-12-04pooled
443-512EdgewoodVerizon—pooled
443-513BerlinAT&T—pooled
443-514CatonsvilleWindstream—pooled
443-515CambridgeVerizon2009-06-08pooled
443-516SykesvilleInteliquent—pooled
443-517Glen BurnieLumen—pooled
443-518ColumbiaVerizon2008-12-16pooled
443-519TowsonLumen—pooled
443-520CatonsvilleAT&T—
443-521CambridgeVerizon—pooled
443-522ReisterstownWindstream—pooled
443-523SalisburyVerizon—pooled
443-524BaltimoreVerizon—
443-525BaltimoreAT&T2009-03-20pooled
443-526Havre de GraceWindstream—pooled
443-527BaltimoreT-Mobile2001-03-19
443-528Bel AirT-Mobile—pooled
443-529BaltimoreT-Mobile2008-07-22pooled
443-530DundalkWindstream—pooled
443-531BaltimoreAT&T2009-03-20pooled
443-532Prince FrederickT-Mobile—pooled
443-533JarrettsvilleAT&T—pooled
443-534AnnapolisVerizon2001-01-15pooled
443-535ColumbiaVerizon—pooled
443-536WestminsterT-Mobile—pooled
443-537ColumbiaVerizon—pooled
443-538ColumbiaT-Mobile2001-06-20
443-539ColumbiaWindstream—pooled
443-540BaltimoreAT&T—
443-541CockeysvilleWindstream—pooled
443-542ColumbiaComcast—pooled
443-543ArbutusVerizon—pooled
443-544PikesvilleWindstream2001-05-10pooled
443-545ColumbiaLumen2001-05-18pooled
443-546ColumbiaVerizon—pooled
443-547WestminsterVerizon2009-05-07pooled
443-548PikesvilleVerizon—pooled
443-549DundalkWindstream—pooled
443-550North BeachLumen—pooled
443-551WoodlawnLumen—pooled
443-552BaltimoreVerizon—pooled
443-553ElktonVerizon—
443-554ChaseT-Mobile2001-07-23pooled
443-556CockeysvilleVerizon—
443-557Glen BurnieVerizon—pooled
443-558AberdeenVerizon2001-01-15pooled
443-559EssexComcast—pooled
443-560BaltimoreT-Mobile2011-07-18pooled
443-561ElkridgeWindstream—pooled
443-562BaltimoreAT&T—
443-563BaltimoreT-Mobile2006-11-14pooled
443-564TowsonLumen—pooled
443-565RandallstownWindstream2001-05-10pooled
443-566Chesapeake CityVerizon2004-09-16pooled
443-567Bel AirLumen—pooled
443-568ArbutusVerizon—pooled
443-569AnnapolisLumen—pooled
443-570BaltimoreT-Mobile—
443-571BaltimoreVerizon2011-12-06pooled
443-572Glen BurnieVerizon—pooled
443-573BaltimoreWindstream—pooled
443-574Ellicott CityWindstream—pooled
443-575ArbutusWindstream2001-05-10pooled
443-576RandallstownVerizon2001-02-21pooled
443-577Glen BurnieWindstream—pooled
443-578Cockeysville——pooled
443-579EssexWindstream—pooled
443-580BaltimoreT-Mobile2011-08-25pooled
443-581ChaseInteliquent—pooled
443-582ChurchvilleWindstream—pooled
443-583ColumbiaWindstream—pooled
443-584CroftonWindstream—pooled
443-585DarlingtonWindstream—pooled
443-586Dundalk——pooled
443-587EdgewoodWindstream—pooled
443-588ParkvilleVerizon—pooled
443-589CockeysvilleWindstream—pooled
443-590ReisterstownLumen—pooled
443-591Glen BurnieVerizon2009-05-07pooled
443-592Elkridge——pooled
443-593ElktonWindstream—pooled
443-594Sparrows PointLumen—pooled
443-595Sparks GlencoeBandwidth—pooled
443-596Essex——pooled
443-597Severna ParkT-Mobile—pooled
443-598Sherwood ForestBandwidth—pooled
443-599SevernT-Mobile—pooled
443-600EssexT-Mobile2001-07-23pooled
443-601FallstonWindstream—pooled
443-602BaltimoreVerizon2007-02-15pooled
443-603AnnapolisWindstream—pooled
443-604BaltimoreVerizon—
443-605WestminsterWindstream—pooled
443-606ForkWindstream—pooled
443-607West RiverWindstream—pooled
443-608TowsonAT&T2009-02-27pooled
443-609SykesvilleWindstream—pooled
443-610BaltimoreVerizon—pooled
443-612CatonsvilleVerizon—
443-613TowsonAT&T2009-02-27pooled
443-614SalisburyVerizon2001-07-23
443-615BaltimoreVerizon2007-05-10pooled
443-616Bel AirWindstream—pooled
443-617FallstonVerizon2005-04-11pooled
443-618Glen BurnieVerizon—pooled
443-619Bel AirVerizon2009-06-05pooled
443-620WaterlooAT&T—pooled
443-621BaltimoreT-Mobile—pooled
443-622BaltimoreT-Mobile—pooled
443-623Glen BurnieT-Mobile2002-08-20pooled
443-624Prince FrederickVerizon2002-03-06pooled
443-625ForkLumen2001-02-21pooled
443-626ChaseWindstream2001-05-10pooled
443-627BaltimoreLumen—pooled
443-628Glen Burnie——pooled
443-629BaltimoreT-Mobile—pooled
443-630BaltimoreVerizon2008-05-08pooled
443-631CatonsvilleAT&T2005-08-16pooled
443-632TowsonWindstream—pooled
443-633BaltimoreT-Mobile2011-07-18pooled
443-634WaterlooVerizon2011-11-09pooled
443-635BaltimoreAT&T2009-10-14pooled
443-636CatonsvilleT-Mobile—pooled
443-637Armiger-Gibson IslandVerizon2001-02-21pooled
443-638Ellicott City——
443-639HampsteadWindstream—pooled
443-640Bel AirWindstream2001-05-18pooled
443-641PikesvilleLumen2001-05-18pooled
443-642BaltimoreVerizon2006-11-08pooled
443-643Bel AirVerizon—pooled
443-644JarrettsvilleWindstream—pooled
443-645MillersvilleWindstream—pooled
443-646North BeachWindstream—pooled
443-647New WindsorWindstream—pooled
443-648EssexAT&T—pooled
443-649Sparrows PointWindstream2001-06-20pooled
443-650ReisterstownVerizon2001-02-20pooled
443-651BaltimoreVerizon2011-07-08pooled
443-652TowsonT-Mobile—pooled
443-653ParkvilleT-Mobile2001-05-18pooled
443-654WaterlooVerizon2008-08-28pooled
443-655Bel AirAT&T—pooled
443-656ColumbiaWindstream2001-05-10pooled
443-657RandallstownLumen—pooled
443-658WoodlawnInteliquent—
443-659West RiverInteliquent—
443-660PikesvilleComcast—pooled
443-661WaterlooWindstream—pooled
443-662Sparks GlencoeWindstream2001-05-10pooled
443-663WoodlawnVerizon—pooled
443-664Ocean CityWindstream—pooled
443-665Nanticoke——pooled
443-666ChestertownLumen2012-05-23pooled
443-667DelmarVerizon2023-05-16pooled
443-668CatonsvilleAT&T2001-01-15pooled
443-669DelmarWindstream—pooled
443-670CatonsvilleWindstream2001-05-10pooled
443-671New WindsorAT&T—pooled
443-672ParktonAT&T—pooled
443-673Brooklyn Park LinthicumWindstream2001-05-10pooled
443-674North EastAT&T—pooled
443-675RandallstownWindstream—pooled
443-676BaltimoreAT&T2001-06-20
443-677BaltimoreT-Mobile2001-03-15pooled
443-678ParkvilleVerizon—pooled
443-679SevernAT&T—pooled
443-680BaltimoreT-Mobile2010-09-27pooled
443-681BaltimoreVerizon2009-06-05pooled
443-682BaltimoreVerizon2006-12-19pooled
443-683BaltimoreVerizon2007-04-09pooled
443-684Prince FrederickVerizon2008-10-08pooled
443-685SevernWindstream—pooled
443-686FallstonVerizon—pooled
443-687BaltimoreVerizon2009-09-08pooled
443-688SevernWindstream2001-05-10pooled
443-689CockeysvilleWindstream2001-05-10pooled
443-690BaltimoreVerizon—
443-691BaltimoreAT&T2001-01-15
443-692BaltimoreVerizon—pooled
443-693PerryvilleAT&T—pooled
443-694Severna ParkT-Mobile2001-04-20pooled
443-695BaltimoreVerizon—
443-696DundalkWindstream2001-05-10pooled
443-697Catonsville——
443-698OdentonAT&T—pooled
443-699AnnapolisVerizon2011-08-10pooled
443-701ArbutusVerizon—pooled
443-702Armiger-Gibson IslandWindstream2001-05-10pooled
443-703BaltimoreVerizon—pooled
443-704OdentonWindstream2001-05-10pooled
443-705CockeysvilleVerizon—pooled
443-706CrisfieldWindstream—pooled
443-707AberdeenT-Mobile—pooled
443-708BaltimoreLumen—pooled
443-709ArbutusWindstream—pooled
443-710CatonsvilleVerizon—pooled
443-712ReisterstownWindstream—pooled
443-713Glen BurniePeerless Network2012-09-19pooled
443-714AnnapolisAT&T—pooled
443-715North EastWindstream—pooled
443-716AnnapolisWindstream—pooled
443-717BaltimoreVerizon2005-09-14pooled
443-718ColumbiaWindstream2008-03-05pooled
443-719JarrettsvilleWindstream—pooled
443-720AberdeenVerizon2012-11-27pooled
443-721BaltimoreVerizon2009-07-06pooled
443-722BaltimoreT-Mobile2001-03-09
443-723BaltimoreT-Mobile2011-10-06pooled
443-724EastonWindstream—pooled
443-725ParkvilleWindstream—pooled
443-726BaltimoreT-Mobile2011-10-06pooled
443-727BishopvilleWindstream—pooled
443-728BerlinWindstream—pooled
443-729WoodlawnWindstream—pooled
443-730EssexWindstream—pooled
443-731Port DepositAT&T—pooled
443-732Silver RunAT&T—pooled
443-733WaterlooAT&T—pooled
443-734SevernVerizon—pooled
443-735SalisburyAT&T—
443-736SalisburyAT&T—pooled
443-737WaterlooWindstream—pooled
443-738PikesvilleWindstream—pooled
443-739BaltimoreT-Mobile2001-07-23
443-740BaltimoreLumen2005-02-03pooled
443-741ColumbiaVerizon2011-03-29pooled
443-742BaltimoreAT&T—
443-743BaltimoreVerizon2008-04-07pooled
443-744ReisterstownT-Mobile2002-07-02pooled
443-745ColumbiaVerizon—
443-746EastonLumen2002-02-22pooled
443-747Port Deposit—2002-02-22pooled
443-748MillersvilleWindstream2001-05-11pooled
443-749Glen BurnieWindstream—pooled
443-750BaltimoreVerizon2010-06-08pooled
443-751WoodlawnWindstream2001-05-11pooled
443-752Bel AirVerizon2001-10-17pooled
443-753WaterlooVerizon—pooled
443-754SalisburyVerizon2010-06-09pooled
443-755WaterlooVerizon—pooled
443-756BaltimoreAT&T—
443-757ElkridgeWindstream2001-05-11pooled
443-758AnnapolisVerizon—pooled
443-759BaltimoreVerizon2007-10-29pooled
443-760AberdeenAT&T—pooled
443-761TowsonT-Mobile2008-05-28pooled
443-762BaltimoreT-Mobile2001-01-10pooled
443-763Glen BurnieT-Mobile—pooled
443-764Glen BurnieT-Mobile2008-08-21pooled
443-765CatonsvilleAT&T2001-07-23pooled
443-766ColumbiaWindstream2005-05-18pooled
443-767WorthingtonWindstream2001-05-11pooled
443-768BaltimoreT-Mobile2001-05-18pooled
443-769BaltimoreT-Mobile2008-09-16pooled
443-770Armiger-Gibson IslandVerizon—pooled
443-771Prince FrederickVerizon2010-09-08pooled
443-772EssexWindstream2001-07-23pooled
443-773Brooklyn Park LinthicumVerizon—pooled
443-774ColumbiaAT&T2018-11-19pooled
443-775AnnapolisVerizon2014-10-08pooled
443-776ElkridgeBandwidth2014-01-17pooled
443-777EssexVerizon—pooled
443-778WaterlooVerizon—pooled
443-779AberdeenVerizon—pooled
443-780WoodlawnWindstream2001-07-23pooled
443-781Armiger-Gibson IslandInteliquent—pooled
443-782AnnapolisVerizon—pooled
443-783SalisburyVerizon—
443-784Armiger-Gibson IslandAT&T—pooled
443-785ArbutusInteliquent—
443-786EastonVerizon—pooled
443-787Bel AirWindstream—pooled
443-788AberdeenT-Mobile—pooled
443-789WestminsterAT&T—pooled
443-790Glen BurnieT-Mobile2001-11-19pooled
443-791TowsonAT&T—pooled
443-792Brooklyn Park LinthicumVerizon2007-10-18pooled
443-793ParkvilleVerizon—pooled
443-794BaltimoreAT&T—
443-795SevernVerizon—pooled
443-796PikesvilleVerizon—pooled
443-797TowsonVerizon—pooled
443-798TowsonLumen—pooled
443-799BaltimoreAT&T2001-07-23
443-800BaltimoreT-Mobile2011-01-31pooled
443-801BaltimoreT-Mobile—pooled
443-802BaltimoreT-Mobile—pooled
443-803BaltimoreT-Mobile—pooled
443-804BaltimoreT-Mobile—pooled
443-805Glen BurnieT-Mobile2008-07-24pooled
443-806BaltimoreT-Mobile2006-03-08pooled
443-807FallstonT-Mobile—pooled
443-808AnnapolisBandwidth2014-04-04pooled
443-809TowsonLumen2014-06-13pooled
443-810BaltimoreT-Mobile2008-09-04pooled
443-812ColumbiaVerizon2001-01-15pooled
443-813BaltimoreVerizon2007-09-14pooled
443-814BaltimoreVerizon2010-06-15pooled
443-815EssexVerizon—pooled
443-816Severna ParkVerizon—pooled
443-817Armiger-Gibson IslandVerizon—pooled
443-818Armiger-Gibson IslandLumen2005-12-30pooled
443-819Bel AirT-Mobile2015-01-21pooled
443-820ElkridgeWindstream—pooled
443-821WestminsterT-Mobile2010-07-13pooled
443-822AnnapolisT-Mobile—pooled
443-823TowsonVerizon2006-07-13pooled
443-824TowsonT-Mobile2001-05-18pooled
443-825BaltimoreT-Mobile2006-11-29pooled
443-826BaltimoreVerizon2010-06-25pooled
443-827BaltimoreVerizon—pooled
443-828Ellicott CityWindstream2001-05-11pooled
443-829BaltimoreT-Mobile—pooled
443-830CatonsvilleWindstream2001-08-21pooled
443-831BaltimoreAT&T—
443-832ColumbiaLumen—pooled
443-833ArbutusWindstream—pooled
443-834TowsonVerizon—pooled
443-835BaltimoreVerizon2008-12-11pooled
443-836BaltimoreVerizon2013-01-21pooled
443-837AnnapolisWindstream2001-09-24pooled
443-838BaltimoreAT&T—
443-839BaltimoreT-Mobile2006-04-17pooled
443-840CatonsvilleAT&T2005-05-04pooled
443-841TowsonVerizon—pooled
443-842BaltimoreVerizon2011-03-10pooled
443-843Havre de GraceVerizon—pooled
443-844BaltimoreVerizon2006-02-13pooled
443-845BaltimoreVerizon—pooled
443-846TowsonAT&T—pooled
443-847TowsonVerizon2006-10-12pooled
443-848Glen BurnieT-Mobile—pooled
443-849TowsonVerizon2001-05-18
443-850BaltimoreT-Mobile2001-09-24
443-851CatonsvilleT-Mobile2001-08-21pooled
443-852AnnapolisAT&T2001-08-21pooled
443-853BaltimoreVerizon2010-07-27pooled
443-854BaltimoreT-Mobile2001-11-19
443-855AberdeenWindstream2005-05-20pooled
443-856Ocean City—2002-07-02pooled
443-857BaltimoreT-Mobile—
443-858BaltimoreT-Mobile—
443-859SalisburyT-Mobile—pooled
443-860CatonsvilleAT&T2005-05-04pooled
443-861AberdeenVerizon2009-08-13pooled
443-862TowsonVerizon2011-10-07pooled
443-863BaltimoreVerizon2010-08-09pooled
443-864ColumbiaT-Mobile2001-12-19pooled
443-865BaltimoreT-Mobile2002-04-19pooled
443-866Bel AirT-Mobile2002-07-02pooled
443-867Glen BurnieWindstream—pooled
443-868EssexVerizon—pooled
443-869BaltimoreVerizon2006-06-12pooled
443-870PikesvilleLumen—pooled
443-871AnnapolisT-Mobile—pooled
443-872BaltimoreWindstream—pooled
443-873BaltimoreInteliquent2010-02-23pooled
443-874BaltimoreWindstream—pooled
443-875AnnapolisAT&T—pooled
443-876Bel AirT-Mobile—pooled
443-877North EastLumen—pooled
443-878ColumbiaVerizon—pooled
443-879DundalkVerizon—pooled
443-880SalisburyAT&T—pooled
443-881ReisterstownT-Mobile—pooled
443-882BaltimoreT-Mobile2011-02-01pooled
443-883Glen BurnieAT&T—pooled
443-884BaltimoreWindstream—pooled
443-885BaltimoreVerizon—pooled
443-886CockeysvilleAT&T—pooled
443-887CatonsvilleWindstream2010-05-05pooled
443-888Princess AnneWindstream2011-01-06pooled
443-889Glen BurnieT-Mobile2001-04-20pooled
443-890BaltimoreVerizon2011-08-10pooled
443-891Glen BurnieVerizon—pooled
443-892New WindsorBandwidth2011-08-11pooled
443-893WoodlawnVerizon—pooled
443-894BaltimoreT-Mobile2011-06-30pooled
443-895TowsonVerizon2007-04-09pooled
443-896ColumbiaAT&T—pooled
443-897BaltimoreAT&T2011-04-12pooled
443-898PikesvilleLumen2005-12-08pooled
443-899WaterlooLumen—pooled
443-900TowsonVerizon2012-05-23pooled
443-901TowsonWindstream2001-08-21pooled
443-902BaltimoreVerizon2011-01-06pooled
443-903Bel AirVerizon2011-09-07pooled
443-904BaltimoreVerizon2001-10-17pooled
443-905AnnapolisAT&T—pooled
443-906Severna ParkPeerless Network2012-09-20pooled
443-907ElktonVerizon2001-04-20pooled
443-908BaltimoreVerizon2011-06-29pooled
443-909BaltimoreVerizon2006-08-09pooled
443-910Bel AirAT&T2001-04-20pooled
443-912Towson—2002-07-02pooled
443-913BaltimoreT-Mobile2011-06-30pooled
443-914WorthingtonAT&T—pooled
443-915BaltimoreVerizon2011-09-07pooled
443-916BaltimoreT-Mobile2011-08-22pooled
443-917ColumbiaInteliquent2011-10-07pooled
443-918TaneytownAT&T—pooled
443-919BaltimoreWindstream—
443-920SykesvilleAT&T—pooled
443-921TowsonWindstream—pooled
443-922EdgewoodWindstream2006-02-07pooled
443-923BaltimoreWindstream2001-05-11
443-924AnnapolisVerizon2009-07-06pooled
443-925BaltimoreT-Mobile2006-02-24pooled
443-926AnnapolisLumen—pooled
443-927BaltimoreLumen—pooled
443-928BaltimoreVerizon2001-09-24pooled
443-929PikesvilleT-Mobile2001-04-20pooled
443-930BaltimoreVerizon2011-04-06pooled
443-931BaltimoreVerizon2011-10-24pooled
443-932BaltimoreT-Mobile2011-08-22pooled
443-933CockeysvilleAT&T2004-04-20pooled
443-934BaltimoreVerizon2007-12-04pooled
443-935TowsonAT&T2006-07-31pooled
443-936ElkridgeAT&T2017-02-23pooled
443-937Union BridgeAT&T—pooled
443-938BaltimoreVerizon2007-08-06pooled
443-939BaltimoreT-Mobile2002-09-23pooled
443-940PikesvilleWindstream2001-08-21pooled
443-941ElktonAT&T2011-09-07pooled
443-942Severna ParkAT&T—pooled
443-943Sparrows PointAT&T—pooled
443-944SalisburyComcast2006-06-08pooled
443-945ElktonAT&T2002-07-02pooled
443-946Parkville——pooled
443-947PerryvilleWindstream—pooled
443-948BaltimoreT-Mobile2011-08-22pooled
443-949AnnapolisComcast2006-06-28pooled
443-951AnnapolisLumen—pooled
443-952WestminsterVerizon2011-09-07pooled
443-953SalisburyVerizon2011-09-07pooled
443-954BaltimoreWindstream2005-07-06pooled
443-955BaltimoreVerizon2006-03-13pooled
443-956BaltimoreAT&T—
443-957BaltimoreAT&T—pooled
443-960Glen BurnieVerizon2011-10-07pooled
443-961Baltimore—2014-12-23pooled
443-962Glen BurnieVerizon2007-09-14pooled
443-963BaltimoreBandwidth—pooled
443-964North BeachLumen2006-05-12pooled
443-965BaltimoreT-Mobile2006-06-21pooled
443-966FallstonVerizon2006-09-13pooled
443-967North EastVerizon2001-04-20pooled
443-968Prince FrederickAT&T—pooled
443-969EssexWindstream2001-05-11pooled
443-970BaltimoreVerizon2011-11-21pooled
443-971TaneytownBandwidth2011-02-16pooled
443-972CambridgeWindstream2011-11-21pooled
443-973Ellicott CityVerizon—pooled
443-974WestminsterAT&T—pooled
443-975Prince FrederickAT&T—pooled
443-977BaltimoreVerizon2006-10-12pooled
443-978SalisburyVerizon2011-11-21pooled
443-979ColumbiaVerizon2011-11-21pooled
443-980CatonsvilleAT&T—pooled
443-981FallstonVerizon2011-11-21pooled
443-982Baltimore—2007-05-30pooled
443-983BaltimoreT-Mobile2002-07-02pooled
443-984BaltimoreVerizon—
443-985RandallstownT-Mobile2001-06-20pooled
443-986BaltimoreVerizon2006-07-13pooled
443-987Bel AirVerizon—pooled
443-988CentrevilleLumen2006-06-08pooled
443-989Glen BurnieWindstream2001-05-11pooled
443-990BaltimoreBandwidth2011-02-04pooled
443-991TowsonVerizon2011-12-01pooled
443-992BaltimoreLumen—pooled
443-993ElktonT-Mobile2010-12-13pooled
443-994AnnapolisAT&T—
443-995AnnapolisAT&T—
443-996CatonsvilleAT&T—
443-997BaltimoreVerizon—
443-998ParkvilleVerizon2001-03-19pooled

How to read this page

Everything above comes from three public sources: the numbering metadata, which names the zones and the line types of the range and, outside North America, its place; and the regulator's allocation table, which lists each block's status and holder and, in North America, the rate centres the place is named from. NANPA’s NPA report adds what it says about the whole area code: its state or province, the codes sharing its area, when it went into service, local dialling and relief planning. None of them knows who serves a number today, whether a handset is switched on, or who owns or answers it. Spaw reports what the tables say and names the dataset and version behind every answer.

More area codes in the United States

nanpa-co-codes 2026-10-18 · nanpa-rate-centres 2026-10-18 · nanpa-npa-report 2026-10-20 · newest data dated 2026-10-20 · about the regulator’s table

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