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  2. 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]

  3. Area codes 757 and 948 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_757_and_948

    In 2019, area code 757 was projected to exhaust its numbering resources by late 2021, triggering planning for mitigation of central office code exhausion, and the announcements of planning for an overlay complex, [1] and the selection of area code 948 in 2020. [2] An overlay was chosen over the option of splitting 757.

  4. List of Virginia area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Virginia_area_codes

    540/826 — Central and North including Fredericksburg, Roanoke, Warrenton, and Winchester (July 15, 1995 as split from 703). 571/703 — Northern Virginia including the cities of Alexandria , Fairfax , and Falls Church as well as Arlington , Fairfax , and Loudoun counties (703 created October 1947 as original area code for Virginia; 571 ...

  5. United States Department of Veterans Affairs - Wikipedia

    en.wikipedia.org/wiki/United_States_Department...

    The United States Department of Veterans Affairs (VA) is a Cabinet-level executive branch department of the federal government charged with providing lifelong healthcare services to eligible military veterans at the 170 VA medical centers and outpatient clinics located throughout the country. Non-healthcare benefits include disability ...

  6. Area codes 804 and 686 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_804_and_686

    Area code 804 is predicted to run out of central office prefixes in the third quarter of 2024. The State Corporation Commission (SCC) announced on November 16, 2022, that it would overlay the existing area code, likely in the first half of 2024. [ 3 ]

  7. Area codes 703 and 571 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_703_and_571

    The red-colored area is the northern region of the Commonwealth of Virginia served by area code 703 and its overlay code 571.. Area codes 703 and 571 are telephone area codes in the North American Numbering Plan (NANP) for Northern Virginia, including the independent cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park, as well as all of Arlington and Fairfax counties and ...

  8. Interchangeable NPA and central office codes - Wikipedia

    en.wikipedia.org/wiki/Interchangeable_NPA_and...

    By 1971 the North American network had been prepared for operation with central office codes that permitted the digits 0 and 1 as the middle digit, i.e. with the number format NXX (less N11), where N=2–9, and X=0–9. [4]

  9. Telephone number pooling - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_pooling

    Public resistance to the introduction of new area codes, whether as overlay complexes (which allowed customers to keep their existing numbers, but broke seven-digit local calling) or by area code splits (where the area code of existing numbers was changed), prompted the FCC and state commissions to introduce thousands-block number pooling, i.e. the allocation of number space in blocks of only ...