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240 Area Code

About Area Code 240

State: Maryland
Major City: Germantown
Timezone: Eastern (6:36pm)
Short URL: allareacodes.com/240
Download: Download this data

Area Code 240 Map

  • Aspen Hill, MD
  • Bethesda, MD
  • Bowie, MD
  • Chillum, MD
  • Clinton, MD
  • College Park, MD
  • Cumberland, MD
  • Fairland, MD
  • Fort Washington, MD
  • Frederick, MD
  • Gaithersburg, MD
  • Germantown, MD
  • Greenbelt, MD
  • Hagerstown, MD
  • Landover, MD
  • Montgomery Village, MD
  • North Bethesda, MD
  • North Laurel, MD
  • North Potomac, MD
  • Olney, MD
  • Oxon Hill-glassmanor, MD
  • Potomac, MD
  • Rockville, MD
  • Silver Spring, MD
  • South Laurel, MD
  • St. Charles, MD
  • Suitland, MD
  • Waldorf, MD
  • Wheaton-glenmont, MD
  • White Oak, MD

More About Area Code 240

Area code 240 was first put in service June 1, 1997. Currently, the largest city it serves is Germantown, MD, and it overlaps coverage areas with area codes 227 and 301.

Overview of Active Prefixes

Assigned to Carrier

Usage

Carriers

Active Phone Number Prefixes

Prefix
Usage
Primary City
Carrier
Introduced
Landline
Mount Rainier
Bandwidth.com Clec
Introduced 10/04/2010
Landline
Ridge
Peerless Network Of The District Of Columbia, Dc
Introduced 07/22/1999
Wireless
Hagerstown
Sprint Spectrum L.p.
Introduced 10/04/2011
Wireless
Bethesda
Cellco Partnership DBA Verizon Wireless
Introduced 09/07/2011
Wireless
Cabin John
New Cingular Wireless PCS - DC
Introduced 07/23/2003
Landline
Glenn Dale
Xo Maryland
Introduced 10/31/2001
Landline
Damascus
Cavalier East LLC
Introduced 08/20/2000
Landline
La Plata
Peerless Network Of The District Of Columbia, Dc
Introduced 07/22/1999
Landline
Indian Head
Peerless Network Of The District Of Columbia, Dc
Introduced 07/22/1999
Wireless
Waldorf
New Cingular Wireless PCS - DC
Introduced 08/20/2000
Landline
Oakland
Core Communications
Introduced 06/13/2000
Landline
Waldorf
Peerless Network Of The District Of Columbia, Dc
Introduced 07/22/1999
Landline
Mechanicsville
Peerless Network Of The District Of Columbia, Dc
Introduced 07/22/1999
Landline
Frederick
Telcove Operations
Introduced 01/14/2000
Wireless
Waldorf
Sprint Spectrum L.p.
Introduced 03/15/2001
Wireless
Hagerstown
Omnipoint Communications Cap Operations
Introduced 04/16/2001
Landline
Nanjemoy
Peerless Network Of The District Of Columbia, Dc
Introduced 02/27/1999
Landline
Poolesville
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Rockville
Verizon Maryland
Introduced 05/10/1999
Landline
Waldorf
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Mount Rainier
Allegiance Telecom
Introduced 02/27/1999
Wireless
Gaithersburg
Cellco Partnership DBA Verizon Wireless
Introduced 09/10/2012
Landline
Frederick
Core Communications
Introduced 06/13/2000
Landline
Laurel
Verizon Maryland
Introduced 11/20/1998
Landline
Waldorf
Broadwing Communications. LLC
Introduced 07/22/1999
Landline
Hughesville
Global Crossing Local Services-md
Introduced 05/10/1999
Landline
Hagerstown
Core Communications
Introduced 06/13/2000
Landline
Mount Rainier
Broadwing Communications. LLC
Introduced 07/22/1999
Landline
Newburg
Teleport Communications America - DC
Introduced 02/27/1999
Wireless
Mount Rainier
Cellco Partnership DBA Verizon Wireless
Introduced 10/04/2011
Landline
Bethesda
Paetec Communications
Introduced 10/13/1999
Landline
Frederick
Verizon Maryland
Introduced 06/13/2000
Landline
Callaway
Teleport Communications America - DC
Introduced 02/27/1999
Landline
Rockville
Paetec Communications
Introduced 10/13/1999
Landline
Leonardtown
Core Communications
Introduced 10/31/2000
Landline
Chevy Chase
Starpower Communications
Introduced 02/27/1999
Landline
Kensington
Starpower Communications
Introduced 02/27/1999
Landline
Gaithersburg
Allegiance Telecom
Introduced 01/14/2000
Landline
Mount Rainier
Starpower Communications
Introduced 02/27/1999
Landline
Glenn Dale
Starpower Communications
Introduced 02/27/1999
Landline
Gaithersburg
Starpower Communications
Introduced 11/20/1998
Landline
Mount Rainier
Allegiance Telecom
Introduced 02/27/1999
Landline
Ridge
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Mechanicsville
Teleport Communications America - DC
Introduced 02/27/1999
Landline
Brandywine
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Highfield
Core Communications
Introduced 06/13/2000
Landline
Gaithersburg
Level 3 Communications
Introduced 05/10/1999
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Hughesville
Teleport Communications America - DC
Introduced 02/27/1999
Landline
Poolesville
Peerless Network Of Maryland
Introduced 07/22/1999
Landline
Leonardtown
Teleport Communications America - DC
Introduced 02/27/1999
Landline
Nanjemoy
Teleport Communications America - DC
Introduced 02/27/1999
Landline
Ridge
Teleport Communications America - DC
Introduced 02/27/1999
Landline
Mount Rainier
Allegiance Telecom
Introduced 06/13/2000
Wireless
Callaway
Sprint Spectrum L.p.
Introduced 10/17/2011
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 11/10/2011
Landline
Beltsville
Verizon Maryland
Introduced 02/27/1999
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 11/10/2011
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Rockville
Allegiance Telecom
Introduced 02/27/1999
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 02/27/1999
Wireless
Waldorf
Cellco Partnership DBA Verizon Wireless
Introduced 11/07/2011
Wireless
Bethesda
New Cingular Wireless PCS - DC
Introduced 02/27/1999
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 11/10/2011
Landline
Mount Rainier
Broadwing Communications. LLC
Introduced 07/22/1999
Wireless
Bethesda
New Cingular Wireless PCS - DC
Introduced 02/27/1999
Landline
Grantsville
Core Communications
Introduced 10/31/2000
Landline
Rockville
Verizon Maryland
Introduced 05/04/2004
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 10/18/2002
Wireless
Laurel
Cellco Partnership DBA Verizon Wireless
Introduced 07/08/2011
Landline
Waldorf
Core Communications
Introduced 10/31/2000
Landline
Laurel
Comcast Phone Of Northern Maryland
Introduced 03/03/2001
Wireless
Bethesda
New Cingular Wireless PCS - DC
Introduced 10/13/1999
Landline
Mechanicsville
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Kensington
Paetec Communications
Introduced 10/13/1999
Landline
Frostburg
Level 3 Communications
Introduced 11/01/2004
Landline
Frederick
Cellco Partnership DBA Verizon Wireless
Introduced 06/13/2000
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 09/17/2002
Landline
Hancock
Core Communications
Introduced 06/13/2000
Landline
Thurmont
Comcast Phone Of Northern Maryland
Introduced 11/01/2004
Landline
Oxon Hill
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Mount Rainier
Allegiance Telecom
Introduced 02/27/1999
Wireless
Hagerstown
New Cingular Wireless PCS - DC
Introduced 10/15/2002
Landline
Kensington
Verizon Maryland
Introduced 10/13/1999
Landline
Mount Rainier
Starpower Communications
Introduced 02/27/1999
Landline
Laurel
Xo Maryland
Introduced 06/30/2001
Landline
Laurel
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Hyattsville
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
College Park
Level 3 Communications
Introduced 10/13/1999
Wireless
Leonardtown
Cellco Partnership DBA Verizon Wireless
Introduced 10/13/1999
Wireless
Waldorf
Sprint Spectrum L.p.
Introduced 10/13/1999
Wireless
Waldorf
Cellco Partnership DBA Verizon Wireless
Introduced 12/07/2010
Landline
Clinton
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Wireless
Mount Rainier
Sprint Spectrum L.p.
Introduced 07/03/2002
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 02/27/1999
Landline
Gaithersburg
Allegiance Telecom
Introduced 06/13/2000
Landline
Emmitsburg
AT&T Local
Introduced 03/27/2003
Wireless
Damascus
New Cingular Wireless PCS - DC
Introduced 08/20/2000
Wireless
Leonardtown
Cellco Partnership DBA Verizon Wireless
Introduced 09/10/2012
Wireless
Hagerstown
Uscoc Of Cumberland DBA United States Cel Md
Introduced 02/27/1999
Landline
Capitol Heights
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Hagerstown
Verizon Maryland
Introduced 10/31/2000
Landline
Rockville
Verizon Maryland
Introduced 06/13/2000
Landline
Frederick
Verizon Maryland
Introduced 08/20/2000
Wireless
Chevy Chase
Sprint Spectrum L.p.
Introduced
Landline
Callaway
Starpower Communications
Introduced 11/20/1998
Landline
Clinton
Verizon Maryland
Introduced 01/14/2000
Wireless
Columbia
Cellco Partnership DBA Verizon Wireless
Introduced 06/06/2008
Landline
Waldorf
Cavalier East LLC
Introduced 10/31/2000
Wireless
Oakland
Uscoc Of Cumberland DBA United States Cel Md
Introduced 02/27/1999
Landline
Mccoole
Core Communications
Introduced 10/31/2000
Landline
Emmitsburg
Core Communications
Introduced 10/31/2000
Landline
Clarksville
Ymax Communications Corp.
Introduced 10/08/2008
Landline
Damascus
Core Communications
Introduced 10/31/2000
Landline
Upper Marlboro
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Gaithersburg
Core Communications
Introduced 10/31/2000
Landline
Rockville
Verizon Maryland
Introduced 08/20/2000
Landline
Hagerstown
Level 3 Communications
Introduced 10/31/2000
Wireless
Cabin John
Sprint Spectrum L.p.
Introduced 12/14/2007
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Newburg
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Mount Rainier
Cavalier East LLC
Introduced 05/09/2001
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Glenn Dale
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Bethesda
Core Communications
Introduced 10/31/2000
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 02/27/1999
Wireless
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 01/14/2000
Landline
Upper Marlboro
Cavalier East LLC
Introduced 10/31/2000
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 08/18/2011
Landline
Adamstown
Mci Worldcom Communications
Introduced 02/25/2009
Landline
Sandy Spring
Starpower Communications
Introduced 11/20/1998
Wireless
Hancock
Cellco Partnership DBA Verizon Wireless
Introduced 05/10/2011
Wireless
Frederick
New Cingular Wireless PCS - DC
Introduced 10/15/2002
Landline
Sandy Spring
Level 3 Communications
Introduced 03/09/2006
Wireless
Waldorf
Sprint Spectrum L.p.
Introduced 08/20/2000
Landline
Hagerstown
Bandwidth.com Clec
Introduced 08/04/2008
Landline
Oxon Hill
Level 3 Communications
Introduced 08/20/2000
Landline
La Plata
Global Crossing Local Services-md
Introduced 05/10/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 05/10/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 05/10/1999
Landline
La Plata
Peerless Network Of Maryland
Introduced 02/27/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 05/10/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 05/10/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 05/10/1999
Landline
Frederick
Level 3 Communications
Introduced 03/03/2001
Wireless
Frederick
Cellco Partnership DBA Verizon Wireless
Introduced 06/12/2006
Landline
Damascus
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Indian Head
Peerless Network Of Maryland
Introduced 02/27/1999
Wireless
Laurel
Omnipoint Communications Cap Operations
Introduced 09/17/2013
Landline
Gaithersburg
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Cumberland
Verizon Maryland
Introduced 02/27/1999
Landline
Kensington
Global Naps South
Introduced 02/27/1999
Landline
Gaithersburg
Cavalier East LLC
Introduced 05/09/2001
Landline
Damascus
Baltimore-washington Telephone (bwt)
Introduced 08/20/2000
Landline
Williamsport
AT&T Local
Introduced 03/03/2001
Wireless
Frederick
Sprint Spectrum L.p.
Introduced 10/18/2002
Landline
Waldorf
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Mount Airy
Core Communications
Introduced 10/31/2000
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 12/14/2007
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 02/27/1999
Wireless
Gaithersburg
Sprint Spectrum L.p.
Introduced 10/13/1999
Landline
Odenton
Verizon Maryland
Introduced 11/20/1998
Landline
Laurel
Global Crossing Local Services-md
Introduced 02/27/1999
Wireless
Capitol Heights
Sprint Spectrum L.p.
Introduced 11/20/1998
Landline
Hughesville
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Indian Head
Global Crossing Local Services-md
Introduced 05/10/1999
Landline
Cumberland
Core Communications
Introduced 10/31/2000
Landline
Frederick
Verizon Maryland
Introduced 03/03/2001
Wireless
Cabin John
Cellco Partnership DBA Verizon Wireless
Introduced 09/17/2007
Wireless
Silver Spring
New Cingular Wireless PCS - DC
Introduced 01/14/2000
Landline
Hagerstown
Teleport Communications America
Introduced 06/11/2009
Wireless
Chevy Chase
New Cingular Wireless PCS - DC
Introduced 08/20/2000
Landline
Callaway
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Myersville
Verizon Maryland
Introduced 10/31/2000
Landline
Gaithersburg
Verizon Maryland
Introduced 08/20/2000
Landline
Chevy Chase
Cavalier East LLC
Introduced 01/14/2000
Wireless
Gaithersburg
Sprint Spectrum L.p.
Introduced 11/04/2002
Landline
Sandy Spring
Atx Telecommunications Services, Ltd
Introduced 06/30/2001
Landline
Sandy Spring
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Oxon Hill
Starpower Communications
Introduced 02/27/1999
Wireless
Cabin John
Cellco Partnership DBA Verizon Wireless
Introduced 06/13/2000
Wireless
Mount Airy
New Cingular Wireless PCS - DC
Introduced 12/13/2004
Landline
Bethesda
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Wireless
Frederick
Cellco Partnership DBA Verizon Wireless
Introduced 03/06/2009
Wireless
Cabin John
Sprint Spectrum L.p.
Introduced 07/03/2002
Landline
Chevy Chase
Xo Maryland
Introduced 10/13/1999
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 08/18/2011
Wireless
Rockville
New Cingular Wireless PCS - DC
Introduced 11/20/1998
Landline
College Park
Mci Worldcom Communications
Introduced 09/21/2010
Landline
Rockville
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Gaithersburg
Xo Maryland
Introduced 02/13/2001
Landline
Frederick
Us Lec Of Maryland
Introduced 07/27/2004
Wireless
Rockville
Leap Wireless Intl DBA Cricket Comm
Introduced 09/17/2009
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Wireless
Rockville
Leap Wireless Intl DBA Cricket Comm
Introduced 10/14/2009
Wireless
Frederick
New Cingular Wireless PCS - DC
Introduced 02/27/1999
Wireless
Waldorf
Sprint Spectrum L.p.
Introduced 01/16/2001
Wireless
Hyattsville
Omnipoint Communications Cap Operations
Introduced 03/12/2001
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Frederick
Ymax Communications Corp.
Introduced 12/16/2008
Wireless
Waldorf
New Cingular Wireless PCS - DC
Introduced 05/18/2001
Wireless
Capitol Heights
Sprint Spectrum L.p.
Introduced 03/03/2001
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 11/12/2001
Wireless
Waldorf
Cellco Partnership DBA Verizon Wireless
Introduced 10/29/2007
Landline
Hagerstown
Verizon Maryland
Introduced 07/22/1999
Wireless
Rockville
Omnipoint Communications Cap Operations
Introduced 04/09/2001
Wireless
Frederick
Omnipoint Communications Cap Operations
Introduced 05/15/2002
Wireless
Silver Spring
Omnipoint Communications Cap Operations
Introduced 05/21/2001
Wireless
Mount Rainier
Sprint Spectrum L.p.
Introduced 11/16/2007
Landline
Cabin John
Dslnet Communications Va
Introduced 01/25/2001
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 10/25/2001
Landline
Waldorf
Xo Maryland
Introduced 04/23/2001
Landline
Rockville
Bandwidth.com Clec
Introduced 10/14/2009
Wireless
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 12/19/2006
Landline
Kensington
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Wireless
Tall Timbers
Sprint Spectrum L.p.
Introduced 10/31/2000
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 02/27/1999
Landline
Silver Spring
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Leonardtown
Broadwing Communications. LLC
Introduced 10/31/2000
Wireless
Waldorf
Cellco Partnership DBA Verizon Wireless
Introduced 05/07/2009
Landline
Ijamsville
Telcove Operations
Introduced 08/20/2000
Landline
Sandy Spring
Xo Maryland
Introduced 06/30/2001
Wireless
Silver Spring
Sprint Spectrum L.p.
Introduced 08/15/2011
Wireless
Frederick
Cellco Partnership DBA Verizon Wireless
Introduced 06/06/2008
Wireless
Frederick
Leap Wireless Intl DBA Cricket Comm
Introduced 02/27/2009
Wireless
Oxon Hill
Omnipoint Communications Cap Operations
Introduced 06/06/2001
Landline
Oakland
Verizon Maryland
Introduced 05/22/2001
Wireless
Laurel
Cellco Partnership DBA Verizon Wireless
Introduced 09/07/2011
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 11/10/2011
Wireless
Frederick
Cellco Partnership DBA Verizon Wireless
Introduced 08/09/2001
Wireless
Rockville
New Cingular Wireless PCS - DC
Introduced 02/27/1999
Wireless
Waldorf
Sprint Spectrum L.p.
Introduced 09/07/2011
Wireless
Gaithersburg
New Cingular Wireless PCS - DC
Introduced 03/03/2001
Landline
Silver Spring
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Landline
Hagerstown
Lumos Networks Inc. - VA
Introduced 07/22/2010
Landline
Rockville
Verizon Maryland
Introduced 11/20/1998
Wireless
Gaithersburg
Paetec Communications
Introduced 04/22/2005
Landline
Oxon Hill
Paetec Communications
Introduced 06/20/2001
Landline
Laurel
Verizon Maryland
Introduced 08/20/2000
Wireless
Frederick
Cellco Partnership DBA Verizon Wireless
Introduced 09/04/2008
Wireless
Waldorf
Cellco Partnership DBA Verizon Wireless
Introduced 10/04/2011
Wireless
Laurel
Cellco Partnership DBA Verizon Wireless
Introduced 07/27/2010
Wireless
Silver Spring
New Cingular Wireless PCS - DC
Introduced 07/22/1999
Wireless
Silver Spring
New Cingular Wireless PCS - DC
Introduced 07/22/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 02/27/1999
Wireless
Silver Spring
New Cingular Wireless PCS - DC
Introduced 02/27/1999
Landline
Chevy Chase
Sprint Spectrum L.p.
Introduced 05/10/1999
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 02/27/1999
Wireless
Mechanicsville
New Cingular Wireless PCS - DC
Introduced 10/31/2001
Landline
Oxon Hill
Comcast Phone Of Northern Maryland
Introduced 04/25/2013
Wireless
Mount Rainier
Sprint Spectrum L.p.
Introduced 11/16/2007
Wireless
Hagerstown
Sprint Spectrum L.p.
Introduced 02/14/2008
Wireless
Laurel
Cellco Partnership DBA Verizon Wireless
Introduced 10/04/2011
Landline
Silver Spring
Global Crossing Local Services-md
Introduced 02/27/1999
Wireless
Silver Spring
New Cingular Wireless PCS - DC
Introduced 08/20/2000
Landline
College Park
Cavalier Telephone Mid-atlantic
Introduced 08/20/2000
Wireless
Silver Spring
New Cingular Wireless PCS - DC
Introduced 08/20/2000
Wireless
Silver Spring
Omnipoint Communications Cap Operations
Introduced 02/21/2001
Landline
Gaithersburg
Lightwave Communications
Introduced 05/20/2005
Wireless
Cabin John
New Cingular Wireless PCS - DC
Introduced 07/27/2004
Wireless
Oxon Hill
Cellco Partnership DBA Verizon Wireless
Introduced 04/07/2008
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 09/27/2010
Wireless
Silver Spring
Omnipoint Communications Cap Operations
Introduced 05/11/2001
Landline
Cabin John
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Oxon Hill
Comcast Phone Of Northern Maryland
Introduced 10/31/2001
Landline
Cabin John
Us Lec Of Maryland
Introduced 01/14/2000
Wireless
Glenn Dale
Omnipoint Communications Cap Operations
Introduced 03/12/2001
Landline
Hyattsville
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Oakland
Shentel Communications
Introduced 05/16/2012
Landline
Poolesville
Xo Maryland
Introduced 02/13/2001
Wireless
Middletown
Omnipoint Communications Cap Operations
Introduced 06/12/2001
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Capitol Heights
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Oxon Hill
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Mount Rainier
Cavalier East LLC
Introduced 05/09/2001
Wireless
Mount Rainier
Cellco Partnership DBA Verizon Wireless
Introduced 10/29/2013
Landline
Chevy Chase
Verizon Maryland
Introduced 10/31/2000
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 10/31/2000
Landline
Cabin John
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Hagerstown
Us Lec Of Maryland
Introduced 10/21/2010
Wireless
Silver Spring
Sprint Spectrum L.p.
Introduced 10/08/2001
Wireless
Silver Spring
Sprint Spectrum L.p.
Introduced 10/04/2011
Landline
Newburg
Peerless Network Of Maryland
Introduced 04/09/2013
Wireless
Silver Spring
Sprint Spectrum L.p.
Introduced 10/04/2011
Wireless
Silver Spring
Omnipoint Communications Cap Operations
Introduced 10/31/2001
Wireless
Rockville
New Cingular Wireless PCS - DC
Introduced 01/09/2002
Wireless
Cabin John
Cellco Partnership DBA Verizon Wireless
Introduced 09/05/2008
Wireless
Capitol Heights
Sprint Spectrum L.p.
Introduced 02/27/1999
Landline
Crofton
Bandwidth.com Clec
Introduced 03/31/2008
Landline
Upper Marlboro
Xo Maryland
Introduced 10/31/2001
Landline
College Park
Core Communications
Introduced 08/08/2006
Wireless
Hagerstown
Sprint Spectrum L.p.
Introduced 10/19/2011
Landline
Cabin John
Us Lec Of Maryland
Introduced 01/14/2000
Wireless
Bethesda
New Cingular Wireless PCS - DC
Introduced 06/20/2001
Landline
Silver Spring
Us Lec Of Maryland
Introduced 01/14/2000
Wireless
Waldorf
Sprint Spectrum L.p.
Introduced 10/21/2011
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 11/10/2011
Wireless
Hagerstown
Sprint Spectrum L.p.
Introduced 03/29/2006
Wireless
Cumberland
Sprint Spectrum L.p.
Introduced 12/12/2001
Landline
La Plata
Xo Maryland
Introduced 02/13/2001
Landline
Laurel
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Upper Marlboro
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Leonardtown
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Hagerstown
Verizon Maryland
Introduced 10/31/2000
Landline
Hughesville
Broadwing Communications. LLC
Introduced 10/31/2000
Landline
Frederick
Verizon Maryland
Introduced 10/31/2000
Landline
Waldorf
Local Access LLC
Introduced 08/01/2013
Wireless
Oxon Hill
Cellco Partnership DBA Verizon Wireless
Introduced 10/29/2013
Landline
Mount Rainier
Teleport Communications America - DC
Introduced 07/22/1999
Wireless
Silver Spring
New Cingular Wireless PCS - DC
Introduced 01/09/2001
Landline
Sandy Spring
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Leonardtown
Xo Maryland
Introduced 02/13/2001
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 02/27/1999
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 10/31/2011
Landline
College Park
Us Lec Of Maryland
Introduced 01/14/2000
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 07/25/2006
Landline
Glenn Dale
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Upper Marlboro
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Clinton
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Laurel
Level 3 Communications
Introduced 07/22/1999
Landline
Mount Rainier
Allegiance Telecom
Introduced 10/31/2000
Wireless
Rockville
Leap Wireless Intl DBA Cricket Comm
Introduced 03/26/2009
Wireless
Rockville
Leap Wireless Intl DBA Cricket Comm
Introduced 03/25/2009
Wireless
Rockville
Leap Wireless Intl DBA Cricket Comm
Introduced 03/25/2009
Landline
Mount Rainier
Allegiance Telecom
Introduced 08/20/2000
Landline
Laurel
Allegiance Telecom
Introduced 10/31/2000
Landline
Glenn Dale
Paetec Communications
Introduced 10/31/2001
Landline
Kensington
Cavalier Telephone Mid-atlantic
Introduced 06/30/2001
Landline
Sandy Spring
Allegiance Telecom
Introduced 10/31/2000
Landline
Chevy Chase
Xo Maryland
Introduced 04/23/2001
Wireless
Leonardtown
Cellco Partnership DBA Verizon Wireless
Introduced 07/07/2008
Wireless
Laurel
Omnipoint Communications Cap Operations
Introduced 12/30/2005
Landline
Frederick
Verizon Maryland
Introduced 06/11/2002
Landline
Rockville
Verizon Maryland
Introduced 07/12/2006
Landline
Laurel
Verizon Maryland
Introduced 07/22/1999
Landline
Upper Marlboro
Global Crossing Local Services-md
Introduced 07/22/1999
Landline
Frederick
Level 3 Communications
Introduced 12/30/2005
Wireless
Leonardtown
Cellco Partnership DBA Verizon Wireless
Introduced 08/09/2006
Wireless
Frederick
Cellco Partnership DBA Verizon Wireless
Introduced 07/08/2011
Wireless
Cumberland
Sprint Spectrum L.p.
Introduced 06/14/2001
Landline
Laurel
Paetec Communications - DC
Introduced 03/03/2001
Landline
Hyattsville
Verizon Maryland
Introduced 07/22/1999
Landline
Beltsville
Verizon Maryland
Introduced 04/28/2010
Wireless
Waldorf
Cellco Partnership DBA Verizon Wireless
Introduced 06/29/2011
Landline
Frederick
Verizon Maryland
Introduced 12/22/2006
Wireless
Leonardtown
Cellco Partnership DBA Verizon Wireless
Introduced 07/06/2009
Wireless
Laurel
Omnipoint Communications Cap Operations
Introduced 03/13/2001
Wireless
Chevy Chase
Cellco Partnership DBA Verizon Wireless
Introduced 09/13/2006
Landline
Gaithersburg
Peerless Network Of Maryland
Introduced 02/27/1999
Landline
Rockville
Broadwing Communications. LLC
Introduced 07/22/1999
Wireless
Mount Rainier
Sprint Spectrum L.p.
Introduced 04/27/2011
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 07/22/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 07/22/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 07/22/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 07/22/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 07/22/1999
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 07/22/1999
Landline
Waldorf
Global Crossing Local Services-md
Introduced 05/10/1999
Wireless
Frederick
365 Wireless
Introduced 03/11/2013
Landline
Mount Rainier
Tw Telecom Of Maryland LLC
Introduced 08/04/2010
Landline
Hyattsville
Us Lec Of Maryland
Introduced 04/05/2012
Wireless
Rockville
Metro PCS
Introduced 07/16/2013
Wireless
Hyattsville
Metro PCS
Introduced 05/29/2013
Landline
College Park
Mci Worldcom Communications
Introduced 06/30/2001
Unknown
Shentel Communications
Introduced 05/12/2014
Landline
Chevy Chase
Mci Worldcom Communications
Introduced 08/20/2000
Landline
Rockville
Mci Worldcom Communications
Introduced 08/20/2000
Landline
Kensington
Mci Worldcom Communications
Introduced 08/20/2000
Landline
Greenbelt
Verizon Maryland
Introduced 06/13/2000
Wireless
Hagerstown
Sprint Spectrum L.p.
Introduced 04/17/2001
Wireless
Frederick
Sprint Spectrum L.p.
Introduced 05/10/1999
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Frederick
Verizon Maryland
Introduced 10/13/1999
Landline
Mount Rainier
Bandwidth.com Clec
Introduced 10/31/2011
Landline
Gaithersburg
Verizon Maryland
Introduced 11/20/1998
Landline
Gaithersburg
Verizon Maryland
Introduced 07/22/1999
Landline
Mount Rainier
Broadwing Communications. LLC
Introduced 05/10/1999
Wireless
Waldorf
Leap Wireless Intl DBA Cricket Comm
Introduced 03/24/2009
Wireless
Silver Spring
Omnipoint Communications Cap Operations
Introduced 05/16/2002
Landline
Chevy Chase
Xo Maryland
Introduced 10/31/2000
Landline
Chevy Chase
Xo Maryland
Introduced 10/31/2000
Landline
Laurel
Cavalier East LLC
Introduced 10/13/1999
Landline
Cabin John
Broadvox-clec - DC
Introduced 11/17/2011
Wireless
Frederick
Halo Wireless Services
Introduced 11/28/2011
Landline
Mechanicsville
Xo Maryland
Introduced 02/13/2001
Wireless
Gaithersburg
New Cingular Wireless PCS - DC
Introduced 05/19/2006
Landline
Silver Spring
Verizon Maryland
Introduced 01/14/2000
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Damascus
Starpower Communications
Introduced 11/20/1998
Landline
Kensington
Comcast Phone Of Northern Maryland
Introduced 10/31/2000
Landline
Mount Rainier
Local Access LLC
Introduced 03/06/2012
Wireless
Mount Rainier
Sprint Spectrum L.p.
Introduced 10/31/2000
Landline
Rockville
Cellco Partnership DBA Verizon Wireless
Introduced 10/31/2000
Wireless
Frederick
Sprint Spectrum L.p.
Introduced 10/13/1999
Wireless
Myersville
New Cingular Wireless PCS - DC
Introduced 05/10/1999
Wireless
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 02/27/1999
Wireless
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 02/27/1999
Landline
Waldorf
Starpower Communications
Introduced 11/20/1998
Landline
Gaithersburg
Verizon Maryland
Introduced 03/03/2001
Landline
Greenbelt
Verizon Maryland
Introduced 10/31/2000
Landline
Brandywine
Global Crossing Local Services-md
Introduced 05/10/1999
Landline
Gaithersburg
Verizon Maryland
Introduced 03/03/2001
Wireless
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 02/27/1999
Wireless
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 06/12/2006
Landline
Mount Rainier
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Rockville
Verizon Maryland
Introduced 11/20/1998
Landline
Temple Hills
Verizon Maryland
Introduced 11/20/1998
Landline
Hyattsville
Level 3 Communications
Introduced 07/22/1999
Landline
Adamstown
Verizon Maryland
Introduced 05/22/2001
Wireless
Silver Spring
Leap Wireless Intl DBA Cricket Comm
Introduced 03/25/2009
Wireless
Mount Rainier
Leap Wireless Intl DBA Cricket Comm
Introduced 03/25/2009
Wireless
Chevy Chase
Leap Wireless Intl DBA Cricket Comm
Introduced 03/25/2009
Wireless
Chevy Chase
Leap Wireless Intl DBA Cricket Comm
Introduced 03/26/2009
Wireless
Hagerstown
New Cingular Wireless PCS - DC
Introduced 01/27/2012
Wireless
Columbia
Level 3 Communications
Introduced 06/08/2012
Wireless
Columbia
Cellco Partnership DBA Verizon Wireless
Introduced 11/01/2011
Landline
Laurel
Peerless Network Of Maryland
Introduced 11/02/2011
Landline
Rockville
Global Crossing Local Services-md
Introduced 02/27/1999
Wireless
Mount Rainier
Omnipoint Communications Cap Operations
Introduced 11/15/2013
Landline
Callaway
Xo Maryland
Introduced 02/13/2001
Landline
Gaithersburg
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Sandy Spring
Global Crossing Local Services-md
Introduced 02/27/1999
Landline
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 05/10/1999
Landline
Mount Rainier
Cavalier East LLC
Introduced 10/31/2000
Landline
Lexington Park
Verizon Maryland
Introduced 11/20/1998
Wireless
Cumberland
New Cingular Wireless PCS - DC
Introduced 07/22/1999
Wireless
Rockville
New Cingular Wireless PCS - DC
Introduced 10/31/2000
Landline
Hagerstown
Bandwidth.com Clec
Introduced 03/22/2012
Landline
Mount Rainier
Cavalier East LLC
Introduced 05/09/2001
Landline
Oxon Hill
Local Access LLC
Introduced 11/16/2006
Landline
Mount Rainier
Broadwing Communications. LLC
Introduced 05/10/1999
Landline
Damascus
Xo Maryland
Introduced 10/31/2001
Landline
Mount Rainier
Cavalier East LLC
Introduced 05/09/2001
Wireless
Gaithersburg
New Cingular Wireless PCS - DC
Introduced 05/06/2005
Landline
Gaithersburg
Telcove Operations
Introduced 08/20/2000
Landline
Bethesda
Telcove Operations
Introduced 08/20/2000
Landline
Rockville
Telcove Operations
Introduced 08/20/2000
Landline
Waldorf
Level 3 Communications
Introduced 11/11/2011
Landline
Laurel
Comcast Phone Of Northern Maryland
Introduced 01/05/2006
Landline
Mount Rainier
Peerless Network Of Maryland
Introduced 07/22/1999
Wireless
Mount Rainier
Cellco Partnership DBA Verizon Wireless
Introduced 08/22/2012
Landline
Chevy Chase
Xo Maryland
Introduced 10/31/2000
Landline
Chevy Chase
Xo Maryland
Introduced 10/31/2000
Landline
Chevy Chase
Xo Maryland
Introduced 10/31/2000
Landline
Capitol Heights
Cavalier East LLC
Introduced 05/09/2001
Landline
Oxon Hill
Comcast Phone Of Northern Maryland
Introduced 11/22/2004
Wireless
Frederick
Cellco Partnership DBA Verizon Wireless
Introduced 11/17/2011
Landline
Rockville
Verizon Maryland
Introduced 10/13/1999
Landline
La Plata
Broadwing Communications. LLC
Introduced 05/10/1999
Landline
Rockville
Verizon Maryland
Introduced 05/10/1999
Landline
Chevy Chase
Xo Maryland
Introduced 10/31/2000
Landline
Sandy Spring
Cavalier East LLC
Introduced 10/31/2000
Landline
Gaithersburg
Broadwing Communications. LLC
Introduced 05/10/1999
Landline
Damascus
Global Crossing Local Services-md
Introduced 05/10/1999
Wireless
Bethesda
Mte DBA Mte Paging Network
Introduced 05/10/1999
Wireless
Myersville
Omnipoint Communications Cap Operations
Introduced 06/06/2001
Landline
Laurel
Broadwing Communications. LLC
Introduced 05/10/1999
Landline
Brandywine
Broadwing Communications. LLC
Introduced 05/10/1999
Landline
Oxon Hill
Broadwing Communications. LLC
Introduced 05/10/1999
Landline
Mount Rainier
Broadwing Communications. LLC
Introduced 05/10/1999
Wireless
Gaithersburg
Sprint Spectrum L.p.
Introduced 03/15/2001
Landline
Callaway
Broadwing Communications. LLC
Introduced 05/10/1999
Landline
Chevy Chase
Core Communications
Introduced 06/22/2012
Wireless
Gaithersburg
Cellco Partnership DBA Verizon Wireless
Introduced 10/04/2013
Wireless
Bethesda
365 Wireless
Introduced 05/10/2013
Wireless
Cumberland
New Cingular Wireless PCS - DC
Introduced 01/27/2012
Landline
Newburg
Xo Maryland
Introduced 04/23/2001
Landline
Poolesville
Global Crossing Local Services-md
Introduced 05/10/1999
Landline
Gaithersburg
Atx Telecommunications Services, Ltd
Introduced 06/30/2001
Landline
Smithsburg
Verizon Maryland
Introduced 10/13/1999
Landline
Silver Spring
Lightwave Communications
Introduced 05/27/2005
Landline
Brandywine
Xo Maryland
Introduced 02/13/2001
Landline
Rockville
Verizon Maryland
Introduced 05/07/2007
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 05/10/1999
Landline
Chevy Chase
Xo Maryland
Introduced 10/31/2000
Landline
Hughesville
Xo Maryland
Introduced 02/13/2001
Wireless
Oxon Hill
Omnipoint Communications Cap Operations
Introduced 03/12/2001
Wireless
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 01/13/2007
Landline
Laurel
Allegiance Telecom
Introduced 10/31/2000
Landline
Glenn Dale
Allegiance Telecom
Introduced 10/31/2000
Landline
College Park
Allegiance Telecom
Introduced 10/31/2000
Landline
Ridge
Xo Maryland
Introduced 02/13/2001
Landline
Chevy Chase
Xo Maryland
Introduced 10/31/2000
Landline
Clinton
Xo Maryland
Introduced 10/31/2000
Wireless
Gaithersburg
Sprint Spectrum L.p.
Introduced 03/03/2001
Wireless
Cabin John
Sprint Spectrum L.p.
Introduced 10/09/2006
Landline
Mount Rainier
Tw Telecom Of Maryland LLC
Introduced 05/10/1999
Landline
Laurel
Tw Telecom Of Maryland LLC
Introduced 05/10/1999
Landline
Rockville
Cavalier East LLC
Introduced 05/09/2001
Landline
Baltimore
Level 3 Communications
Introduced 03/03/2001
Landline
Mount Rainier
Cavalier East LLC
Introduced 05/09/2001
Wireless
Bethesda
Sprint Spectrum L.p.
Introduced 11/20/1998
Landline
Chevy Chase
Broadwing Communications. LLC
Introduced 07/22/1999
Wireless
Capitol Heights
Sprint Spectrum L.p.
Introduced 11/20/1998
Landline
Sandy Spring
Broadwing Communications. LLC
Introduced 07/22/1999
Wireless
Rockville
New Cingular Wireless PCS - DC
Introduced 03/03/2001
Landline
Upper Marlboro
Broadwing Communications. LLC
Introduced 07/22/1999
Wireless
Silver Spring
New Cingular Wireless PCS - DC
Introduced 03/03/2001
Landline
Lexington Park
Verizon Maryland
Introduced 06/30/2001
Landline
Mount Rainier
Broadwing Communications. LLC
Introduced 07/22/1999
Landline
Mount Rainier
Broadwing Communications. LLC
Introduced 07/22/1999
Wireless
Bethesda
Omnipoint Communications Cap Operations
Introduced 03/13/2001
Unknown
Centurylink Communications LLC
Introduced 05/22/2014
Landline
Indian Head
Comcast Phone Of Northern Maryland
Introduced 12/03/2013
Landline
Gaithersburg
Us Lec Of Maryland
Introduced 01/14/2000
Landline
Cumberland
Level 3 Communications
Introduced 05/03/2001
Wireless
Leonardtown
Cellco Partnership DBA Verizon Wireless
Introduced 08/09/2001
Landline
Mount Rainier
Cavalier East LLC
Introduced 10/13/1999
Wireless
Ashton
Omnipoint Communications Cap Operations
Introduced 06/06/2001
Landline
Mount Rainier
Cavalier East LLC
Introduced 05/09/2001
Landline
Cumberland
Verizon Maryland
Introduced 05/27/2008
Landline
College Park
Paetec Communications
Introduced 10/31/2000
Unknown
Baltimore-washington Telephone (bwt)
Introduced 10/17/2005
Landline
Cumberland
Level 3 Communications
Introduced 03/03/2001
Landline
Nanjemoy
Xo Maryland
Introduced 02/13/2001
Wireless
Beltsville
Sprint Spectrum L.p.
Introduced 05/10/1999
Landline
Indian Head
Xo Maryland
Introduced 02/13/2001
Wireless
Rockville
Cellco Partnership DBA Verizon Wireless
Introduced 10/13/1999
Wireless
Silver Spring
Cellco Partnership DBA Verizon Wireless
Introduced 10/13/1999

Heavily Reported Numbers

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