Maryland is served by several area codes that reflect its diverse regions and population dynamics. The state originally adopted the 301 area code in 1947, which predominantly covers the western and central portions, including the capital, Annapolis, and the Baltimore metropolitan area. In response to increasing demand for phone numbers, Maryland introduced a second area code, 410, in 1990, which encompasses areas on the Eastern Shore and parts of the Baltimore region. As population growth and telecommunications advancements continued, the 240 area code was created as an overlay for the 301 region in 1997, further accommodating the need for additional numbers.
As of the most recent census, Maryland has a population of approximately 6 million residents, contributing to a robust telecommunications network that supports both urban and rural communities. The presence of high-tech industries and close proximity to Washington, D.C., has shaped the state’s communication needs and infrastructure.
Additionally, local telecommunications services in Maryland reflect a blend of traditional landline providers and modern mobile networks, addressing the varied connectivity requirements of its population. Unique to Maryland's area codes is the coexistence of multiple overlays, which helps alleviate pressure on existing numbering resources while ensuring that all residents maintain access to essential communication services. Overall, Maryland’s area codes illustrate the evolution of telecommunications within the state, effectively accommodating its growth and technological advancements.
Aspen Hill (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 Potomac (MD)
Olney (MD)
Potomac (MD)
Rockville (MD)
Saint Charles (MD)
Silver Spring (MD)
South Laurel (MD)
Suitland (MD)
Waldorf (MD)
White Oak (MD)
Aspen Hill (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 Potomac (MD)
Olney (MD)
Potomac (MD)
Rockville (MD)
Saint Charles (MD)
Silver Spring (MD)
South Laurel (MD)
Suitland (MD)
Waldorf (MD)
White Oak (MD)
Arbutus (MD)
Arnold (MD)
Annapolis (MD)
Baltimore (MD)
Bel Air North (MD)
Bel Air South (MD)
Carney (MD)
Catonsville (MD)
Columbia (MD)
Crofton (MD)
Dundalk (MD)
Edgewood (MD)
Eldersburg (MD)
Ellicott City (MD)
Essex (MD)
Glen Burnie (MD)
Lochearn (MD)
Middle River (MD)
Milford Mill (MD)
Odenton (MD)
Parkville (MD)
Perry Hall (MD)
Pikesville (MD)
Randallstown (MD)
Reisterstown (MD)
Salisbury (MD)
Severn (MD)
Severna Park (MD)
South Gate (MD)
Towson (MD)
West Elkridge (MD)
Arbutus (MD)
Arnold (MD)
Annapolis (MD)
Baltimore (MD)
Bel Air North (MD)
Bel Air South (MD)
Carney (MD)
Catonsville (MD)
Columbia (MD)
Crofton (MD)
Dundalk (MD)
Edgewood (MD)
Eldersburg (MD)
Ellicott City (MD)
Essex (MD)
Glen Burnie (MD)
Lochearn (MD)
Middle River (MD)
Milford Mill (MD)
Odenton (MD)
Parkville (MD)
Perry Hall (MD)
Pikesville (MD)
Randallstown (MD)
Reisterstown (MD)
Salisbury (MD)
Severn (MD)
Severna Park (MD)
South Gate (MD)
Towson (MD)
West Elkridge (MD)
Arbutus (MD)
Arnold (MD)
Annapolis (MD)
Baltimore (MD)
Bel Air North (MD)
Bel Air South (MD)
Carney (MD)
Catonsville (MD)
Columbia (MD)
Crofton (MD)
Dundalk (MD)
Edgewood (MD)
Eldersburg (MD)
Ellicott City (MD)
Essex (MD)
Glen Burnie (MD)
Lochearn (MD)
Middle River (MD)
Milford Mill (MD)
Odenton (MD)
Parkville (MD)
Perry Hall (MD)
Pikesville (MD)
Randallstown (MD)
Reisterstown (MD)
Salisbury (MD)
Severn (MD)
Severna Park (MD)
South Gate (MD)
Towson (MD)
West Elkridge (MD)
Maryland has 5 area codes (410, 443, 667, 240, 301). These area codes are split between cities or states, so if you want to call to Maryland, you need to know exactly where you would like to call.
The first 3 digits to call Maryland may vary depending on where you want to call to, being one or the other depending on the region or city. Take a look at our listing above to find out which area code you need.
Calling Maryland from another state in the United States is considered a long-distance call. Here’s how to make the call: First, dial the area code for Maryland. Each state, and sometimes specific cities within a state, has unique area codes. Then, enter the 7-digit phone number of the person or business you’re trying to reach. If you’re calling from a landline, check with your provider, as long-distance charges may apply. However, most mobile carriers in the U.S. offer nationwide calling without additional fees. Alternatively, you can use VoIP or internet-based calling apps, like Skype, Zoom, or WhatsApp, to bypass traditional long-distance charges. The number you want to reach should look like this: 1-(AreaCode)-111-2222.
When making calls within the United States, dialing +1 depends on several factors. On most modern mobile phones, carriers automatically recognize the country code when calling within the U.S., so dialing +1 is usually not required; you can simply enter the area code followed by the phone number, such as 213-555-1234. If you’re using a landline, dialing 1 (the U.S. country code) before the area code and phone number is often necessary for long-distance calls; for example, calling from one state to another may require dialing 1-213-555-1234. When calling the U.S. from another country, dialing +1 is necessary, so a call from abroad would be formatted as +1-213-555-1234. VoIP and internet-based calling platforms, like Skype and WhatsApp, generally handle country codes automatically, making it unnecessary to dial +1 manually for U.S. numbers.
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