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The three area codes are overlay codes for one numbering plan area, among which 410 was the initial area code for the NPA, when it was split from area code 301 in 1991. 443 and 667 found assignment primarily in cellular service and for competitive local exchange carriers, such as Comcast and Cavalier Telephone, when introduced, but have since ...
Download QR code; Print/export ... Appearance. move to sidebar hide. The blue area is assigned area codes 301, 240, and 227; the red area is area codes 410, 443 and ...
410: Maryland (Baltimore, Annapolis, Columbia, ... area code 387 is reserved as a fifth code for the region; 438: Quebec (Montreal metropolitan area) November 4, 2006:
For example, Maryland had been served solely by area code 301 from the implementation of the area code system until 1990, when everything from Baltimore eastward was split off as area code 410. Within only five years, 410 was already on the brink of exhaustion due to Baltimore's rapid growth and the proliferation of cell phones, pagers, fax ...
An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan ... 410: Baltimore metropolitan area and the Eastern Shore of Maryland: 447: 217:
Area codes in the United States This page was last edited on 3 February 2012, at 03:26 (UTC) . Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ; additional terms may apply.
Area code 301 was the first area code for all of Maryland, from 1947, when the area code system was created, until 1991, when everything from Baltimore eastward split off as area code 410. In 1997, area code 240 was added as an overlay area code for the 301 territory. On June 14, 2023, a third overlay code, 227, was added to provide more ...
The coastal area to the west was assigned area code 415. [2] Area code 408 was split from numbering plan area 415 in a flash-cut (without permissive dialing period) on March 1, 1959. The new numbering plan area included most of Santa Clara, Santa Cruz, Monterey and San Benito Counties.