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  2. List of Oklahoma area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Oklahoma_area_codes

    The state of Oklahoma is served by the following area codes: 405/572: Central Oklahoma including Oklahoma City (original area code created in 1947; 572 added as overlay on April 24, 2021 [1] [2] [3] 580: Western and southern Oklahoma (split from 405 in 1997) 539/918: Northeastern Oklahoma including Tulsa (918 created in 1953 as split from 405 ...

  3. Area code split - Wikipedia

    en.wikipedia.org/wiki/Area_code_split

    Only new accounts and extra lines receive telephone numbers with the new area code. This method requires ten-digit dialing of local calls for customers of both area codes. Since 2007, most territories use overlays for mitigating numbering shortages. Most area code relief plans today do not even consider splits as relief options. [2]

  4. Area codes 405 and 572 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_405_and_572

    Even though central Oklahoma was home to the great majority of 405's landlines and cell phones, this configuration remained unchanged for 44 years. On November 1, 1997, 405 was reduced to cover only central Oklahoma, while the southern and western portions of the old 405 became area code 580. As a result, 405 is the only area code in Oklahoma ...

  5. North American Numbering Plan expansion - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering...

    A 9 would be inserted as the new second digit of all area codes (e.g. 212 would become 2912, 916 would become 9916). Permissive dialing would be allowed because exchange equipment, on detecting a 9 as the second digit of the area code, would respond appropriately to expect 11 digits, or 10 in the absence of a 9 in that position.

  6. Area codes 918 and 539 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_918_and_539

    Area code 918 was created in 1953 as a split from area code 405. Area code 539 was created as an overlay for 918. It became active on April 1, 2011 (although 539 numbers could have been assigned for activation before that date). Mandatory ten-digit dialing became effective on March 5, 2011. It is the first overlay in Oklahoma.

  7. International Harvester - Wikipedia

    en.wikipedia.org/wiki/International_Harvester

    On February 1, 1974, at 9:00 am, the five-millionth tractor came off the assembly line at the Farmall Plant in Illinois; IH was the first tractor manufacturer to reach that number. [20] Also in 1973, IH officially dropped the "Farmall" name from its tractors, ending a name that had begun with the first Farmall "Regular" in 1924.

  8. Top-two voting is not the only way to have an open primary ...

    www.aol.com/top-two-voting-not-only-100404545.html

    Top-two also has potential to thwart the majority, such as in the 2016 Washington state treasurer election where three Democrats combined for 51.5% of the vote but split the vote so evenly that ...

  9. Ten-digit dialing - Wikipedia

    en.wikipedia.org/wiki/Ten-digit_dialing

    In an area code split, the established practice of relief from 1947 to 1992, the affected numbering plan area is divided into suitable parts, most often two, and assigned a new area code to one of the areas, while maintaining the existing area code in the other. The area that retained the code was most commonly the denser-populated or ...