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240 Area Code 🌍☎️

The 240 Area Code is located in the state of Maryland. Area Code 240 is one of the 269 three-digit telephone area codes in the USA. It covers roughly 7,303,374 unique phone numbers and 1,272,954 individuals near the cities of Frederick, Mount Rainier, and Rockville.

Cities Located in the 240 Area Code

The most populous cities in area code 240 are: Frederick, Mount Rainier, Rockville, Laurel, and Silver Spring.

Other cities in the 240 area code include: Bethesda, Hagerstown, Gaithersburg, Hyattsville, Cabin John, Waldorf, Sandy Spring, Beltsville, Capitol Heights, Cumberland, Chevy Chase, Leonardtown, Columbia, Glenn Dale, College Park, Oxon Hill, Upper Marlboro, Montgomery Village, Kensington, Damascus, Hughesville, Brandywine, Clinton, La Plata, Myersville, Great Mills, Mechanicsville, Ridge, Poolesville, Oakland, Indian Head, Newburg, Westernport, Nanjemoy, Mount Airy, Clarksville, Hancock, Adamstown, Emmitsburg, Middletown, Clear Spring, Thurmont, Grantsville, Smithsburg, Cascade, Williamsport, Greenbelt, Lexington Park, Friendship, Bittinger, Kitzmiller, Brunswick, Keedysville, Lonaconing, Frostburg, Odenton, Ijamsville, Walkersville, District Heights, Temple Hills, New Market, Baltimore, Tall Timbers, Ashton, Crofton, Friendsville, Flintstone, Mount Savage, and Callaway.

Reverse Phone Lookup in Frederick, MD

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About Frederick, Mount Rainier, and Rockville, Maryland

Frederick is a city and the county seat of Frederick County in the U.S. state of Maryland. It is part of the Baltimore–Washington Metropolitan Area. Frederick has been an important crossroads community since it was located in colonial times at the intersection of an important north–south Indian trail, and east–west routes to the Chesapeake Bay both at Baltimore and what became Washington, D.C. and across the Appalachian mountains to the Ohio River watershed. It is a part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area, which is part of a greater Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. The city's population was 65,239 people at the 2010 United States Census, making it the second-largest incorporated city in Maryland, behind Baltimore.Frederick is home to Frederick Municipal Airport (IATA : FDK), which primarily accommodates general aviation traffic, and to the county's largest employer U.S. Army's Fort Detrick bioscience/communications research installation.

Mount Rainier / r eɪ ˈ n ɪər / is a city in Prince George's County, Maryland, United States. The population was 8,080 at the 2010 census. Bordering Washington, D.C., Mount Rainier got its start as a streetcar suburb. (See Streetcars in Washington, D.C.) According to local tradition, surveyors from the Pacific Northwest named the town, giving the streets names such as " Shasta " and " Cascade ". Historic U.S. 1 runs through the center of the town and serves as the main street and central business district.

Rockville is a city located in the central region of Montgomery County, Maryland. It is the county seat and is a major incorporated city of Montgomery County and forms part of the Baltimore–Washington metropolitan area. The 2010 census tabulated Rockville's population at 61,209, making it the third largest incorporated city in Maryland, behind Baltimore and Frederick. Rockville is the largest incorporated city in Montgomery County, Maryland, although the nearby census-designated place of Germantown is more populous. Rockville, along with neighboring Gaithersburg and Bethesda, is at the core of the Interstate 270 Technology Corridor which is home to numerous software and biotechnology companies as well as several federal government institutions. The city also has several upscale regional shopping centers and is one of the major retail hubs in Montgomery County.

What Time Zone is Area Code 240?

The 240 area code lies within the Eastern Daylight Time Zone (or EDT). The current time in Eastern Daylight Time is 6:43 AM on Jul 12, 2024.

Neighborhood Demographics

Statistics based on US Census data for Frederick
37 y/o
Median Age
The median age for Frederick was sourced from the US Census
$92.4K
Median Income
The median income for Frederick was sourced from the US Census
$369K
Median Home Value
The median home value for Frederick was sourced from the US Census
1.27M
Total Population
The total population for Frederick was sourced from the US Census

Area Codes Near Frederick, Mount Rainier, and Rockville, Maryland

Area Code 301
7,744,994 phone numbers
Silver Spring, Rockville, and Hyattsville
Area Code 703
7,679,978 phone numbers
Area Code 571
4,867,613 phone numbers
Area Code 667
2,496,990 phone numbers
Area Code 410
7,766,131 phone numbers
Did you receive an unwanted call from a (240) phone number?
861 Records Found

Phone Number Prefixes in the 240 Area Code

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Unknown
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YMax Communications
Mount Rainier, MD
Unknown
Ridge, MD
Unknown
Cascade, MD
Sprint
Hagerstown, MD
Verizon Wireless
Bethesda, MD
Verizon Wireless
Cabin John, MD
XO Communications
Glenn Dale, MD
Cavalier
Damascus, MD
Peerless Network
La Plata, MD
Unknown
Indian Head, MD
AT&T Mobility
Waldorf, MD
Unknown
--
CoreTel
Oakland, MD
Unknown
Waldorf, MD
Peerless Network
Mechanicsville, MD
Level 3
Frederick, MD
Sprint
Waldorf, MD
T-Mobile
Hagerstown, MD
Peerless Network
Nanjemoy, MD
Onvoy
Ridge, MD
Unknown
Poolesville, MD
Verizon
Rockville, MD
Cavalier
Waldorf, MD
XO Communications
Mount Rainier, MD
MetroPCS
Gaithersburg, MD
CoreTel
Frederick, MD
Unknown
Oakland, MD
Unknown
--
Verizon
Laurel, MD
Sprint
Waldorf, MD
Global Crossing
Hughesville, MD
CoreTel
Hagerstown, MD
Level 3
Mount Rainier, MD
Bandwidth.com
Newburg, MD
Sprint
Mount Rainier, MD
PAETEC
Bethesda, MD
Verizon
Frederick, MD
T-Mobile
Great Mills, MD
PAETEC
Rockville, MD
CoreTel
Leonardtown, MD
Unknown
Frederick, MD
XO Communications
Chevy Chase, MD
RCN Starpower
Mount Rainier, MD
XO Communications
Gaithersburg, MD
Bandwidth.com
Mount Rainier, MD
Bandwidth.com
Glenn Dale, MD
RCN Starpower
Gaithersburg, MD
XO Communications
Mount Rainier, MD
Unknown
Ridge, MD
Onvoy
Mechanicsville, MD
Peerless Network
Brandywine, MD
CoreTel
Cascade, MD
Level 3
Gaithersburg, MD
Global Crossing
Oxon Hill, MD
XO Communications
Hughesville, MD
Unknown
Poolesville, MD
XO Communications
Leonardtown, MD
Bandwidth.com
Nanjemoy, MD
Level 3
Ridge, MD
Unknown
Hughesville, MD
XO Communications
Glenn Dale, MD
Onvoy
Gaithersburg, MD
Sprint
Callaway, MD
Sprint
Bethesda, MD
Verizon
Laurel, MD
Sprint
Bethesda, MD
Unknown
Glenn Dale, MD
Verizon Wireless
Hagerstown, MD
XO Communications
Rockville, MD
Unknown
Mount Rainier, MD
Bandwidth.com
Waldorf, MD
AT&T Mobility
Bethesda, MD
Sprint
Bethesda, MD
T-Mobile
Mount Rainier, MD
AT&T Mobility
Bethesda, MD
CoreTel
Grantsville, MD
Verizon
Rockville, MD
Sprint
Bethesda, MD
Verizon Wireless
Laurel, MD
CoreTel
Waldorf, MD
Comcast
Laurel, MD
AT&T Mobility
Bethesda, MD
Peerless Network
Mechanicsville, MD
PAETEC
Kensington, MD
Bandwidth.com
Frostburg, MD
Verizon Wireless
Frederick, MD
Sprint
Bethesda, MD
CoreTel
Hancock, MD
Bandwidth.com
Thurmont, MD
Cavalier
Oxon Hill, MD
XO Communications
Cabin John, MD
AT&T Mobility
Hagerstown, MD
Level 3
Kensington, MD
Level 3
Mount Rainier, MD
Comcast
Laurel, MD
Cavalier
Laurel, MD
Cavalier
Hyattsville, MD
Level 3
College Park, MD
Verizon Wireless
Leonardtown, MD
Sprint
Waldorf, MD
Sprint
Waldorf, MD
Unknown
Clear Spring, MD
AT&T Mobility
Laurel, MD
Cavalier
Clinton, MD
Sprint
Mount Rainier, MD
Sprint
Beltsville, MD
XO Communications
Gaithersburg, MD
Bandwidth.com
Emmitsburg, MD
AT&T Mobility
Damascus, MD
Verizon Wireless
Leonardtown, MD
AT&T Mobility
Hagerstown, MD
Unknown
--
Cavalier
Capitol Heights, MD
Verizon
Hagerstown, MD
Verizon
Rockville, MD
Verizon Wireless
Frederick, MD
Sprint
Chevy Chase, MD
Bandwidth.com
Great Mills, MD
Comcast
Clinton, MD
Verizon Wireless
Columbia, MD
Verizon Wireless
Waldorf, MD
U.S. Cellular
Oakland, MD
CoreTel
Westernport, MD
CoreTel
Emmitsburg, MD
YMax Communications
Clarksville, MD
CoreTel
Damascus, MD
Cavalier
Upper Marlboro, MD
CoreTel
Montgomery Village, MD
AT&T Mobility
Rockville, MD
Level 3
Hagerstown, MD
T-Mobile
Mount Rainier, MD
Unknown
Mount Rainier, MD
Unknown
Newburg, MD
Cavalier
Mount Rainier, MD
Global Crossing
Glenn Dale, MD
Cavalier
Glenn Dale, MD
CoreTel
Bethesda, MD
CoreTel
Capitol Heights, MD
Verizon Wireless
Silver Spring, MD
Bandwidth.com
Upper Marlboro, MD
Sprint
Bethesda, MD
Comcast
Adamstown, MD
T-Mobile
Sandy Spring, MD
Bandwidth.com
Hancock, MD
AT&T Mobility
Frederick, MD
YMax Communications
Sandy Spring, MD
Sprint
Waldorf, MD
Bandwidth.com
Hagerstown, MD
Level 3
Clinton, MD
Global Crossing
La Plata, MD
Sprint
Beltsville, MD
Sprint
Beltsville, MD
Peerless Network
La Plata, MD
Sprint
Beltsville, MD
Sprint
Beltsville, MD
Sprint
Beltsville, MD
Level 3
Frederick, MD
Verizon Wireless
Frederick, MD
Unknown
Damascus, MD
Unknown
Indian Head, MD
T-Mobile
Laurel, MD
Cavalier
Gaithersburg, MD
U.S. Cellular
Cumberland, MD
Onvoy
Kensington, MD
Cavalier
Gaithersburg, MD
Baltimore-Washington Telephone Company
Damascus, MD
Bandwidth.com
Williamsport, MD
Sprint
Frederick, MD
Unknown
Waldorf, MD
CoreTel
Mount Airy, MD
Sprint
Bethesda, MD
Unknown
Mount Rainier, MD
Sprint
Montgomery Village, MD
Verizon
Odenton, MD
Global Crossing
Laurel, MD
Sprint
Capitol Heights, MD
Unknown
Hughesville, MD
Level 3
Indian Head, MD
CoreTel
Cumberland, MD
Verizon
Frederick, MD
Sprint
Cabin John, MD
AT&T Mobility
Silver Spring, MD
Sprint
Hagerstown, MD
AT&T Mobility
Chevy Chase, MD
Unknown
Great Mills, MD
Verizon Wireless
Myersville, MD
Verizon
Montgomery Village, MD
Cavalier
Chevy Chase, MD
Sprint
Gaithersburg, MD
Bandwidth.com
Sandy Spring, MD
Cavalier
Sandy Spring, MD
Global Crossing
College Park, MD
T-Mobile
Mount Rainier, MD
AT&T Mobility
Cabin John, MD
Bandwidth.com
Mount Airy, MD
Cavalier
Bethesda, MD
Global Crossing
Bethesda, MD
Bandwidth.com
Frederick, MD
Sprint
Cabin John, MD
XO Communications
Chevy Chase, MD
Sprint
Bethesda, MD
AT&T Mobility
Rockville, MD
Verizon Business
College Park, MD
Cavalier
Rockville, MD
Verizon
Montgomery Village, MD
Verizon Wireless
Frederick, MD
Bandwidth.com
Rockville, MD
Level 3
Clinton, MD
T-Mobile
Rockville, MD
AT&T Mobility
Frederick, MD
Unknown
Cumberland, MD
Unknown
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Sprint
Waldorf, MD
T-Mobile
Hyattsville, MD
CoreTel
Mount Rainier, MD
YMax Communications
Frederick, MD
AT&T Mobility
Waldorf, MD
Sprint
Capitol Heights, MD
Sprint
Beltsville, MD
Verizon Wireless
Waldorf, MD
Verizon
Hagerstown, MD
T-Mobile
Rockville, MD
T-Mobile
Frederick, MD
T-Mobile
Silver Spring, MD
Sprint
Mount Rainier, MD
Unknown
Cabin John, MD
Sprint
Bethesda, MD
XO Communications
Waldorf, MD
Bandwidth.com
Rockville, MD
Verizon Wireless
Silver Spring, MD
Cavalier
Kensington, MD
Sprint
Tall Timbers, MD
Sprint
Beltsville, MD
Cavalier
Silver Spring, MD
Verizon Wireless
Leonardtown, MD
Bandwidth.com
Waldorf, MD
Level 3
Ijamsville, MD
T-Mobile
Sandy Spring, MD
Sprint
Silver Spring, MD
Verizon Wireless
Frederick, MD
Sprint
Frederick, MD
T-Mobile
Oxon Hill, MD
YMax Communications
Oakland, MD
Unknown
Oxon Hill, MD
Verizon Wireless
Laurel, MD
Sprint
Bethesda, MD
Verizon Wireless
Frederick, MD
AT&T Mobility
Rockville, MD
Onvoy
Waldorf, MD
AT&T Mobility
Gaithersburg, MD
Cavalier
Silver Spring, MD
Onvoy
Thurmont, MD
Sprint
Hagerstown, MD
Verizon
Rockville, MD
Verizon Wireless
Gaithersburg, MD
PAETEC
Capitol Heights, MD
Verizon
Laurel, MD
Verizon Wireless
Frederick, MD
Sprint
Waldorf, MD
Verizon Wireless
Laurel, MD
AT&T Mobility
Silver Spring, MD
AT&T Mobility
Silver Spring, MD
Sprint
Beltsville, MD
AT&T Mobility
Silver Spring, MD
Sprint
Chevy Chase, MD
CoreTel
Mount Rainier, MD
Bandwidth.com
Mechanicsville, MD
T-Mobile
Hyattsville, MD
Sprint
Mount Rainier, MD
Sprint
Hagerstown, MD
AT&T Mobility
Laurel, MD
Level 3
Silver Spring, MD
AT&T Mobility
Silver Spring, MD
Cavalier
College Park, MD
AT&T Mobility
Gaithersburg, MD
AT&T Mobility
Silver Spring, MD
T-Mobile
Silver Spring, MD
Comcast
Gaithersburg, MD
T-Mobile
Cabin John, MD
Verizon Wireless
Oxon Hill, MD
Sprint
Bethesda, MD
T-Mobile
Silver Spring, MD
US LEC
Cabin John, MD
Sprint
Cabin John, MD
AT&T Mobility
Laurel, MD
US LEC
Cabin John, MD
T-Mobile
Glenn Dale, MD
US LEC
Hyattsville, MD
Onvoy
Oakland, MD
XO Communications
Poolesville, MD
T-Mobile
Middletown, MD
Global Crossing
Silver Spring, MD
US LEC
Capitol Heights, MD
US LEC
Oxon Hill, MD
Cavalier
Mount Rainier, MD
Verizon Wireless
Hyattsville, MD
Verizon Wireless
Leonardtown, MD
Verizon
Chevy Chase, MD
Sprint
Beltsville, MD
US LEC
Rockville, MD
Sprint
Hagerstown, MD
Sprint
Silver Spring, MD
Sprint
Silver Spring, MD
Onvoy
Newburg, MD
Sprint
Silver Spring, MD
T-Mobile
Silver Spring, MD
AT&T Mobility
Rockville, MD
Verizon Wireless
Mount Rainier, MD
Sprint
Capitol Heights, MD
Peerless Network
Crofton, MD
XO Communications
Upper Marlboro, MD
Unknown
--
Onvoy
College Park, MD
Bandwidth.com
Hagerstown, MD
US LEC
Mount Rainier, MD
AT&T Mobility
Bethesda, MD
US LEC
Silver Spring, MD
Verizon Wireless
Columbia, MD
Sprint
Waldorf, MD
Sprint
Bethesda, MD
Sprint
Hagerstown, MD
AT&T Mobility
Rockville, MD
AT&T Mobility
Cumberland, MD
XO Communications
La Plata, MD
Unknown
Laurel, MD
Unknown
Upper Marlboro, MD
CoreTel
Leonardtown, MD
Sprint
Hagerstown, MD
Level 3
Hughesville, MD
AT&T Mobility
Frederick, MD
Unknown
Waldorf, MD
Verizon Business
Silver Spring, MD
Bandwidth.com
Capitol Heights, MD
Sprint
Mount Rainier, MD
Brightlink Communications
Bethesda, MD
AT&T Mobility
Silver Spring, MD
Peerless Network
Sandy Spring, MD
Verizon Wireless
Hagerstown, MD
Verizon Wireless
Leonardtown, MD
Unknown
Mount Rainier, MD
Unknown
Columbia, MD
Sprint
Bethesda, MD
US LEC
College Park, MD
Sprint
Bethesda, MD
US LEC
Glenn Dale, MD
US LEC
Upper Marlboro, MD
US LEC
Clinton, MD
Level 3
Laurel, MD
Unknown
Mount Rainier, MD
Verizon Wireless
Frederick, MD
AT&T Mobility
Rockville, MD
AT&T Mobility
Rockville, MD
AT&T Mobility
Rockville, MD
XO Communications
College Park, MD
XO Communications
Laurel, MD
Unknown
--
PAETEC
Glenn Dale, MD
Onvoy
Oxon Hill, MD
Peerless Network
Kensington, MD
XO Communications
Sandy Spring, MD
Bandwidth.com
Silver Spring, MD
Verizon Wireless
Leonardtown, MD
Unknown
Gaithersburg, MD
Verizon Wireless
Capitol Heights, MD
AT&T Mobility
Laurel, MD
Verizon Wireless
Laurel, MD
Level 3
Frederick, MD
Verizon
Rockville, MD
Verizon
Laurel, MD
Onvoy
Flintstone, MD
Wide Voice
Clarksville, MD
Unknown
Columbia, MD
Verizon Wireless
Leonardtown, MD
Global Crossing
Upper Marlboro, MD
Peerless Network
Ridge, MD
Level 3
Frederick, MD
CoreTel
Hagerstown, MD
Verizon Wireless
Leonardtown, MD
Verizon Wireless
Frederick, MD
T-Mobile
Sandy Spring, MD
Sprint
Cumberland, MD
Verizon Wireless
Laurel, MD
XO Communications
Hyattsville, MD
Verizon
Beltsville, MD
T-Mobile
Laurel, MD
Verizon Wireless
Waldorf, MD
Verizon
Frederick, MD
Verizon Wireless
Leonardtown, MD
CoreTel
Grantsville, MD
CoreTel
Westernport, MD
MetroPCS
Mount Rainier, MD
Unknown
Hagerstown, MD
Unknown
Laurel, MD
T-Mobile
Laurel, MD
CoreTel
Bittinger, MD
Verizon Wireless
Chevy Chase, MD
T-Mobile
Chevy Chase, MD
Peerless Network
Gaithersburg, MD
T-Mobile
Hughesville, MD
Level 3
Rockville, MD
Sprint
Mount Rainier, MD
Sprint
Beltsville, MD
Sprint
Beltsville, MD
Sprint
Beltsville, MD
Sprint
Beltsville, MD
Sprint
Beltsville, MD
Sprint
Beltsville, MD
XO Communications
Waldorf, MD
T-Mobile
Frederick, MD
AT&T Mobility
Cumberland, MD
Verizon Wireless
Chevy Chase, MD
Unknown
--
Level 3
Mount Rainier, MD
Unknown
Hyattsville, MD
T-Mobile
Rockville, MD
MetroPCS
Hyattsville, MD
Unknown
College Park, MD
Onvoy
Hagerstown, MD
T-Mobile
Rockville, MD
Comcast
Capitol Heights, MD
Verizon Wireless
Rockville, MD
Bandwidth.com
Kensington, MD
Unknown
La Plata, MD
Onvoy
Hyattsville, MD
Onvoy
Greenbelt, MD
AT&T Mobility
Hagerstown, MD
Sprint
Frederick, MD
Global Crossing
Kensington, MD
Onvoy
Mechanicsville, MD
Verizon
Frederick, MD
Bandwidth.com
Bethesda, MD
Verizon
Montgomery Village, MD
Verizon
Montgomery Village, MD
Onvoy
Hughesville, MD
CoreTel
Ridge, MD
CoreTel
Newburg, MD
AT&T Mobility
Laurel, MD
Level 3
Chevy Chase, MD
Level 3
Mount Rainier, MD
AT&T Mobility
Laurel, MD
AT&T Mobility
Waldorf, MD
Onvoy
Silver Spring, MD
CoreTel
Cabin John, MD
T-Mobile
Silver Spring, MD
Sprint
Chevy Chase, MD
XO Communications
Chevy Chase, MD
Cavalier
Laurel, MD
CoreTel
Clear Spring, MD
CoreTel
Keedysville, MD
Unknown
Smithsburg, MD
Bandwidth.com
Cabin John, MD
Comcast
Frederick, MD
XO Communications
Mechanicsville, MD
Unknown
Columbia, MD
YMax Communications
Gaithersburg, MD
Onvoy
Kitzmiller, MD
Unknown
Poolesville, MD
Onvoy
Frederick, MD
Vonage Network
Gaithersburg, MD
T-Mobile
Sandy Spring, MD
T-Mobile
Rockville, MD
Onvoy
Great Mills, MD
Verizon
Silver Spring, MD
CoreTel
Middletown, MD
CoreTel
Cumberland, MD
T-Mobile
Cabin John, MD
Unknown
Nanjemoy, MD
Global Crossing
Hyattsville, MD
XO Communications
Damascus, MD
Comcast
Cabin John, MD
Bandwidth.com
Silver Spring, MD
Sprint
Mount Rainier, MD
Verizon Wireless
Rockville, MD
Unknown
Mount Rainier, MD
Sprint
Frederick, MD
AT&T Mobility
Myersville, MD
Verizon Wireless
Silver Spring, MD
Unknown
Hyattsville, MD
Verizon Wireless
Silver Spring, MD
CoreTel
Friendsville, MD
Vonage Network
Frederick, MD
MetroPCS
Brandywine, MD
Verizon Wireless
Waldorf, MD
Verizon
Montgomery Village, MD
Verizon
Greenbelt, MD
Global Crossing
Brandywine, MD
Verizon
Montgomery Village, MD
Verizon Wireless
Silver Spring, MD
Verizon Wireless
Silver Spring, MD
Unknown
Upper Marlboro, MD
Onvoy
Gaithersburg, MD
Verizon Wireless
Upper Marlboro, MD
Unknown
Grantsville, MD
Unknown
Walkersville, MD
Verizon
Rockville, MD
Verizon Wireless
Temple Hills, MD
Level 3
Hyattsville, MD
Unknown
Mechanicsville, MD
Unknown
Myersville, MD
Verizon
Adamstown, MD
AT&T Mobility
Silver Spring, MD
AT&T Mobility
Gaithersburg, MD
Unknown
Sandy Spring, MD
AT&T Mobility
Mount Rainier, MD
AT&T Mobility
Chevy Chase, MD
AT&T Mobility
Mount Rainier, MD
AT&T Mobility
Hagerstown, MD
T-Mobile
Columbia, MD
T-Mobile
Laurel, MD
Verizon Business
Frederick, MD
Verizon Wireless
Columbia, MD
T-Mobile
Laurel, MD
T-Mobile
Hyattsville, MD
Global Crossing
Rockville, MD
T-Mobile
Capitol Heights, MD
Unknown
Leonardtown, MD
XO Communications
Great Mills, MD
Comcast
Capitol Heights, MD
Global Crossing
Gaithersburg, MD
Verizon
District Heights, MD
T-Mobile
Sandy Spring, MD
Verizon Wireless
Silver Spring, MD
Level 3
Oxon Hill, MD
Verizon
Lexington Park, MD
Verizon Wireless
Laurel, MD
AT&T Mobility
Cumberland, MD
Unknown
Rockville, MD
Unknown
Sandy Spring, MD
Unknown
Hagerstown, MD
AT&T Mobility
Rockville, MD
CoreTel
Mount Airy, MD
Unknown
Sandy Spring, MD
Onvoy
Hagerstown, MD
Unknown
Brunswick, MD
Unknown
Laurel, MD
Cavalier
Mount Rainier, MD
Unknown
Hancock, MD
Unknown
Frederick, MD
Atlantech Online Inc
Cabin John, MD
Unknown
Frederick, MD
Unknown
Laurel, MD
Verizon Wireless
Cabin John, MD
Level 3
Cabin John, MD
Bandwidth.com
Damascus, MD
Unknown
Brandywine, MD
Cavalier
Cabin John, MD
Unknown
Mount Rainier, MD
Unknown
Columbia, MD
Verizon Wireless
Gaithersburg, MD
AT&T Mobility
Gaithersburg, MD
Level 3
Bethesda, MD
Verizon Wireless
Rockville, MD
PAETEC
Waldorf, MD
T-Mobile
Laurel, MD
Unknown
Rockville, MD
Unknown
Mount Rainier, MD
AT&T Mobility
Laurel, MD
Unknown
Friendship, MD
Verizon Business
Hyattsville, MD
Unknown
Laurel, MD
Verizon Wireless
Mount Rainier, MD
Onvoy
Friendship, MD
XO Communications
Hyattsville, MD
Sprint
Chevy Chase, MD
XO Communications
Oxon Hill, MD
Cavalier
Capitol Heights, MD
Unknown
Nanjemoy, MD
Unknown
Keedysville, MD
Comcast
Hyattsville, MD
Onvoy
Poolesville, MD
Verizon Wireless
Frederick, MD
Verizon
Rockville, MD
Onvoy
Lonaconing, MD
Onvoy
Westernport, MD
Level 3
La Plata, MD
Verizon
Rockville, MD
Verizon Wireless
Chevy Chase, MD
T-Mobile
Sandy Spring, MD
Level 3
Gaithersburg, MD
Verizon Business
Cabin John, MD
Global Crossing
Damascus, MD
MTE Paging
Bethesda, MD
T-Mobile
Myersville, MD
Unknown
Oakland, MD
Level 3
Laurel, MD
Level 3
Brandywine, MD
Level 3
Capitol Heights, MD
Unknown
Cabin John, MD
Level 3
College Park, MD
Unknown
Hyattsville, MD
Unknown
Frederick, MD
Sprint
Montgomery Village, MD
Level 3
Great Mills, MD
Unknown
Capitol Heights, MD
Unknown
Rockville, MD
Unknown
Sandy Spring, MD
Unknown
Gaithersburg, MD
Unknown
Brandywine, MD
CoreTel
Chevy Chase, MD
Comcast
Gaithersburg, MD
Verizon Wireless
Mount Rainier, MD
Bandwidth.com
Cumberland, MD
XO Communications
Newburg, MD
AT&T Mobility
Gaithersburg, MD
Peerless Network
Indian Head, MD
Unknown
Cumberland, MD
Verizon Wireless
Leonardtown, MD
Unknown
Smithsburg, MD
T-Mobile
Cabin John, MD
Unknown
--
Bandwidth.com
Poolesville, MD
Bandwidth.com
Gaithersburg, MD
Unknown
Laurel, MD
MetroPCS
Frederick, MD
Onvoy
Hagerstown, MD
T-Mobile
Sandy Spring, MD
Verizon Wireless
Smithsburg, MD
Unknown
Williamsport, MD
Unknown
Clarksville, MD
T-Mobile
Silver Spring, MD
Unknown
New Market, MD
XO Communications
Brandywine, MD
Unknown
Cumberland, MD
Onvoy
Hyattsville, MD
Verizon
Rockville, MD
Unknown
Lonaconing, MD
CoreTel
Hyattsville, MD
Unknown
Emmitsburg, MD
Onvoy
Capitol Heights, MD
Onvoy
Frederick, MD
Sprint
Bethesda, MD
XO Communications
Kensington, MD
Unknown
Kitzmiller, MD
Unknown
Clear Spring, MD
Unknown
Cumberland, MD
XO Communications
Hughesville, MD
T-Mobile
Bethesda, MD
Level 3
Silver Spring, MD
Brightlink Communications
Frederick, MD
Verizon Wireless
Laurel, MD
CoreTel
Glenn Dale, MD
CoreTel
College Park, MD
XO Communications
Ridge, MD
XO Communications
Chevy Chase, MD
XO Communications
Clinton, MD
Onvoy
Silver Spring, MD
Sprint
Gaithersburg, MD
Unknown
Hagerstown, MD
Peerless Network
Hagerstown, MD
Unknown
Westernport, MD
Unknown
Myersville, MD
Unknown
Laurel, MD
Unknown
Hyattsville, MD
Sprint
Cabin John, MD
Verizon Wireless
Columbia, MD
Level 3
Mount Rainier, MD
Verizon Wireless
Bethesda, MD
Unknown
Clarksville, MD
MetroPCS
Cumberland, MD
Unknown
Sandy Spring, MD
Onvoy
Mount Savage, MD
Sprint
Mount Rainier, MD
Cavalier
Rockville, MD
Level 3
Baltimore, MD
Unknown
Hagerstown, MD
Verizon Business
Silver Spring, MD
Cavalier
Mount Rainier, MD
Unknown
Rockville, MD
Onvoy
Frederick, MD
Unknown
Great Mills, MD
Unknown
Oxon Hill, MD
Unknown
Adamstown, MD
Unknown
Thurmont, MD
Unknown
Mount Airy, MD
Sprint
Bethesda, MD
Onvoy
Frederick, MD
CoreTel
Hagerstown, MD
Unknown
Hyattsville, MD
Level 3
Kensington, MD
Unknown
Laurel, MD
Sprint
Capitol Heights, MD
T-Mobile
Sandy Spring, MD
Unknown
Newburg, MD
Unknown
Cabin John, MD
Unknown
Hyattsville, MD
Unknown
Sandy Spring, MD
AT&T Mobility
Rockville, MD
Unknown
Rockville, MD
Unknown
Capitol Heights, MD
Unknown
Frederick, MD
Onvoy
Upper Marlboro, MD
AT&T Mobility
Silver Spring, MD
Unknown
Great Mills, MD
Verizon
Lexington Park, MD
Unknown
Hagerstown, MD
Level 3
Mount Rainier, MD
Level 3
Hyattsville, MD
T-Mobile
Bethesda, MD
Onvoy
Hyattsville, MD
Onvoy
La Plata, MD
Unknown
Frederick, MD
Bandwidth.com
Indian Head, MD
Verizon Wireless
Columbia, MD
Unknown
Brandywine, MD
T-Mobile
Hyattsville, MD
T-Mobile
Rockville, MD
Onvoy
Frederick, MD
Unknown
Laurel, MD
Unknown
Frederick, MD
Unknown
--
US LEC
Gaithersburg, MD
Onvoy
Frederick, MD
Unknown
Cascade, MD
Unknown
Frederick, MD
Unknown
Cumberland, MD
AT&T Mobility
Laurel, MD
T-Mobile
Sandy Spring, MD
Unknown
Sandy Spring, MD
AT&T Mobility
Cumberland, MD
Unknown
Rockville, MD
Unknown
Bethesda, MD
Unknown
Oxon Hill, MD
Unknown
Mount Airy, MD
Verizon Wireless
Leonardtown, MD
Unknown
Hughesville, MD
Unknown
Mount Rainier, MD
Unknown
Myersville, MD
Cavalier
Glenn Dale, MD
Unknown
Columbia, MD
Unknown
Frederick, MD
Unknown
Mount Rainier, MD
Unknown
Adamstown, MD
Unknown
Middletown, MD
Unknown
Laurel, MD
Unknown
Sandy Spring, MD
Unknown
Gaithersburg, MD
T-Mobile
Ashton, MD
Unknown
Mount Rainier, MD
Unknown
Mount Rainier, MD
Unknown
Beltsville, MD
Unknown
Bittinger, MD
Unknown
Frostburg, MD
Unknown
Westernport, MD
Unknown
Cabin John, MD
Unknown
Glenn Dale, MD
Unknown
Myersville, MD
Unknown
Leonardtown, MD
Cavalier
Clinton, MD
Unknown
--
Unknown
Hagerstown, MD
Unknown
Hagerstown, MD
Unknown
Hagerstown, MD
Unknown
Hagerstown, MD
Unknown
La Plata, MD
Unknown
Cabin John, MD
Unknown
Damascus, MD
Unknown
--
Unknown
--
Unknown
Hyattsville, MD
Unknown
Poolesville, MD
Unknown
Laurel, MD
Unknown
--
Verizon
Cumberland, MD
PAETEC
College Park, MD
Unknown
Clinton, MD
Unknown
Cumberland, MD
Unknown
Laurel, MD
Unknown
--
Onvoy
Silver Spring, MD
Brightlink Communications
Frederick, MD
Verizon Wireless
Columbia, MD
Unknown
--
Unknown
--
Unknown
--
Unknown
--
Unknown
--
Level 3
Cumberland, MD
Unknown
--
Unknown
--
Unknown
--
Unknown
--
Unknown
--
Onvoy
Williamsport, MD
XO Communications
Nanjemoy, MD
Unknown
--
Sprint
Beltsville, MD
Unknown
--
Unknown
--
Unknown
--
Unknown
--
XO Communications
Indian Head, MD
Verizon Wireless
Rockville, MD
Unknown
Cumberland, MD
Onvoy
Brunswick, MD
Verizon Wireless
Silver Spring, MD
Onvoy
Hancock, MD
Verizon
--

Other Area Codes