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  2. List of Pennsylvania area codes - Wikipedia

    en.wikipedia.org/.../List_of_Pennsylvania_area_codes

    Area code Additional overlay codes Parent of area code splits Location 215 [a] [b] 267, 445: Philadelphia and its immediately surrounding areas in the southeast corner of Pennsylvania 223: 717 [b] 267: 215 [b], 445: 272: 570 [b] 412 [a] [b] 878: Pittsburgh and its immediately surrounding areas in Allegheny County: 445: 215 [b], 267: 484: 610 [b ...

  3. Area codes 215, 267, and 445 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_215,_267,_and_445

    The need for new phone numbers in area codes 215/267 was delayed until 2018. Area code 445 was activated as an additional overlay code on February 3, 2018. [3] This had the effect of assigning 23 million telephone numbers to a service territory of four million people, and 215/267/445 is not projected by the NANP to need a fourth area code until ...

  4. Richboro, Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Richboro,_Pennsylvania

    Area codes: 215, 267 and 445: FIPS code: 42-64464: Richboro is a census-designated place (CDP) in Northampton Township, Bucks County, Pennsylvania, United States. The ...

  5. Category:Area codes in Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Category:Area_codes_in...

    Pages in category "Area codes in Pennsylvania" ... 0–9. Area codes 215, 267, and 445; Area code 412; Area code 445; Area codes 570 and 272; Area codes 610, 484, and ...

  6. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.

  7. American Board of Orthodontics - Wikipedia

    en.wikipedia.org/wiki/American_Board_of_Orthodontics

    Charles H. Tweed was the first certified orthodontist in the United States and Martin Dewey was the first Editor-in-Chief of the American Journal of Orthodontics and Dentofacial Orthopedics. In 1950, ABO required graduates from residencies of orthodontics to present 15 cases and a thesis to get board certified. In 1964, a written examination ...

  8. Area codes 717 and 223 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_717_and_223

    Area codes 717 and 223 are telephone area codes in the North American Numbering Plan (NANP) for South Central Pennsylvania and the Susquehanna Valley. The numbering plan area (NPA) includes the Harrisburg , Lancaster , and York metropolitan areas and a considerable portion of Pennsylvania Dutch Country , an area with nearly two million people.

  9. Area codes 610, 484, and 835 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_610,_484,_and_835

    Area code 835 was eventually approved by the Public Utility Commission on December 2, 2021. Assignment of central office codes in the new area code began on September 2, 2022. [4] When area codes were introduced in 1947, their middle digit was either 0 or 1. In 1994, area code 610 was the last area code assigned with digit 1 in that position.