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2. Area codes 918 and 539 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_918_and_539

   Area codes 918 and 539 are telephone area codes serving Tulsa and northeast Oklahoma. Besides Tulsa, these area codes cover cities such as Bartlesville, Broken Arrow, Claremore, Gore, Jenks, McAlester, Muskogee, Okmulgee, Pryor, Sapulpa, Tahlequah, and northeastern Oklahoma. Area code 918 was created in 1953 as a split from area code 405.

3. List of Oklahoma area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_Oklahoma_area_codes

   Map of Oklahoma with area code boundaries. 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)

4. List of companies based in Tulsa, Oklahoma - Wikipedia

   en.wikipedia.org/wiki/List_of_companies_based_in...

   This is a list of large or well-known interstate or international companies headquartered in the Tulsa Metropolitan Area. As of November 2012, Tulsa was home to one Fortune 1000 and two Fortune 500 companies: Dollar Thrifty Automotive Group, energy companies: ONEOK (#219), and The Williams Companies, Inc. (#342). [18]

5. Computer-Assisted Passenger Prescreening System - Wikipedia

   en.wikipedia.org/wiki/Computer-Assisted...

   CAPPS I was first implemented in the late 1990s, in response to the perceived threat of U.S. domestic and international terrorism.The U.S. government started to implement counter-terrorism measures after several bomb attacks occurred, including the 1995 Oklahoma City bombing, the 1996 Olympics bombing, and the 1998 bombings of two U.S. embassies in East Africa.

6. Area codes 405 and 572 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_405_and_572

   The other three area codes serving Oklahoma are 918 and 539, which cover northeastern Oklahoma (including the city of Tulsa); and 580, which serves western and southern Oklahoma. Area code 405 was one of the original area codes put into service in 1947 by telecom giant AT&T. Until January 1, 1953, it covered the entire state of Oklahoma.

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

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

   Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.