Area codes 410, 443, and 667

Area codes 410, 443, and 667 are telephone area codes in the North American Numbering Plan (NANP) for the eastern part of the U.S. state of Maryland. The numbering plan area (NPA) was created with area code 410 in an area code split of area code 301 in 1991, and includes the Baltimore metropolitan area and the Eastern Shore. The three area codes are overlay codes for the numbering plan area, with 443 and 667 added in 1997 and 2012, respectively.

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