Maryland Phone Numbers
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The 227 area code serves the western counties of Maryland, including Garrett, Allegany, and Washington.
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The 240 area code covers most of Maryland and parts of Montgomery, Prince George's, Frederick, Washington and Allegany counties.
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The 301 area code covers Montgomery and Prince George's Counties in Maryland. It was split off from the 410 area code in 1997.
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Maryland's 410 area code serves the central and eastern areas of the state, including Baltimore, Annapolis, and Ocean City.
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The 443 area code is used in Baltimore, Frederick, and western parts of Maryland. It was created in 2004 as a split from the 410 code.
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The 667 area code covers most of Baltimore City, MD, including the well-known neighborhoods of Canton, Fells Point, and Federal Hill.