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Maryland's area codes highlighted in red and blue. Area codes 410, 443, and 667 are telephone area codes in the North American Numbering Plan (NANP) for the eastern half of the U.S. state of Maryland.The numbering plan area (NPA) includes the Baltimore metropolitan area and the Eastern Shore.The three area codes are overlay codes for one numbering plan area, among which 410 was the initial ...
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Area codes 410, 443, and 667. telephone area codes serving the eastern half of the U.S. state of Maryland. Statements. instance of. telephone prefix. 0 references. image. Area code 410.png 340 × 250; 15 KB. 0 references. Identifiers. Freebase ID /m/0bt8rr. 0 references .
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