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  2. List of Ohio area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Ohio_area_codes

    In 2016, area code 614 was overlaid with 380 in the Columbus/Central Ohio area for the same reason. In 2020, 326 was added as an all services overlay for 937. Area code 283 was added as an overlay for 513 on April 28, 2023. [2] [3] Area code 436 went into service on March 1, 2024, as an overlay of 440. [4]

  3. Original North American area codes - Wikipedia

    en.wikipedia.org/wiki/Original_North_American...

    Telephone dial number card of c.1948 with the local telephone number 4-5876 in Atlantic City, NJ, using the central office prefix 4, later converted to AT4 Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central office prefix, later converted to LA6.

  4. Seven-digit dialing - Wikipedia

    en.wikipedia.org/wiki/Seven-digit_dialing

    They were introduced to postpone area code splits in major cities such as New York City and Los Angeles, but in 1988, AT&T/Bellcore made them mandatory for area codes nearing exhaust of non-interchangeable codes. The Massachusetts 617/508 split was the last one before the policy changed—617 did not yet have interchangeable NXXs at the time.

  5. Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Global_Positioning_System

    As opposed to the year, month, and day format of the Gregorian calendar, the GPS date is expressed as a week number and a seconds-into-week number. The week number is transmitted as a ten- bit field in the C/A and P(Y) navigation messages, and so it becomes zero again every 1,024 weeks (19.6 years).

  6. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    When dialing a telephone number, the area code may have to be preceded by a trunk prefix or national access code for domestic calls, and for international calls by the international access code and country code. Area codes are often quoted by including the national access code. For example, a number in London may be listed as 020 7946 0321.

  7. OPS 5111 - Wikipedia

    en.wikipedia.org/wiki/OPS_5111

    OPS 5111, also known as Navstar 1, NDS-1, GPS I-1 and GPS SVN-1, was an American navigation satellite launched in 1978 as part of the Global Positioning System development program. It was the first GPS satellite to be launched, and one of eleven Block I demonstration satellites.

  8. Area codes 440 and 436 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_440_and_436

    The regions shown in blue are in Ohio. Area codes 440 and 436 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Ohio, serving the parts of the Greater Cleveland area, surrounding the city of Cleveland, but not the city and most of its inner suburbs.

  9. Ohio City, Cleveland - Wikipedia

    en.wikipedia.org/wiki/Ohio_City,_Cleveland

    The City of Ohio became an independent municipality on March 3, 1836, splitting from Brooklyn Township. The city grew from a population of 2,400 people in the early 1830s to over 4,000 in 1850. The city grew from a population of 2,400 people in the early 1830s to over 4,000 in 1850.