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List of Maryland area codes

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The blue area is assigned area codes 301, 240, and 227; the red area is area codes 410, 443 and 667

The state of Maryland is served by the following area codes:

Area codes Numbering plan area
227
240
301		 western Maryland, including its suburbs of Washington, D.C.
410
443
667		 eastern Maryland including Baltimore and Annapolis
Lists of area codes in the North American Numbering Plan
United States
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