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  2. List of Maryland area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Maryland_area_codes

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  3. Area codes 410, 443, and 667 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_410,_443,_and_667

    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.

  4. Area codes 301, 240, and 227 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_301,_240,_and_227

    When an area code is split, the largest city in the old numbering plan area (in this case Baltimore) typically retains the existing area code to minimize expense for changing telephone numbers. However, Bell Atlantic opted to leave the western half of the state in 301 so as to spare the large number of federal agencies on the Maryland side of ...

  5. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

  6. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    Codes 880 through 882 were used (until 1 April 2004) to allow international customers to access toll-free numbers they otherwise could not by paying the international portion of the toll. 880 was paired with 800, 881 with 888, and 882 with 877. [21] 888: toll-free telephone service: March 1, 1996: created; 889: not in use; available for toll ...

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