Area codes 405 and 572 serve the central part of the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sove ...

of Oklahoma. They cover

Oklahoma City Oklahoma City (), officially the City of Oklahoma City, and often shortened to OKC, is the capital and largest city of the U.S. state of Oklahoma. The county seat of Oklahoma County, it ranks 20th among United States cities in population, an ...

and most of its suburbs, including Edmond, El Reno, Norman, Stillwater,

Shawnee The Shawnee are an Algonquian-speaking indigenous people of the Northeastern Woodlands. In the 17th century they lived in Pennsylvania, and in the 18th century they were in Pennsylvania, Ohio, Indiana and Illinois, with some bands in Kentucky a ...

, Chickasha,

Tuttle Tuttle may refer to: Places Canada * Tuttle, Alberta United States * Tuttle, Arkansas * Tuttle, California * Tuttle, Colorado * Tuttle, Oklahoma * Tuttle, North Dakota Other uses * "Tuttle" (''M*A*S*H''), a 1973 episode from the televisio ...

Moore Moore may refer to: People * Moore (surname) ** List of people with surname Moore * Moore Crosthwaite (1907–1989), a British diplomat and ambassador * Moore Disney (1765–1846), a senior officer in the British Army * Moore Powell (died c. 1 ...

, and Guthrie. The other three area codes serving Oklahoma are 918 and 539, which cover northeastern Oklahoma (including the city of

Tulsa Tulsa () is the second-largest city in the state of Oklahoma and 47th-most populous city in the United States. The population was 413,066 as of the 2020 census. It is the principal municipality of the Tulsa Metropolitan Area, a region with ...

); and

580 __NOTOC__ Year 580 ( DLXXX) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 580 for this year has been used since the early medieval period, when the Anno Domini calendar era b ...

, 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 AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile tel ...

. Until January 1, 1953, it covered the entire state of Oklahoma. On that date, northeastern Oklahoma was assigned area code 918. 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 that does not border another state.

Projections

Despite the rapid growth of the Oklahoma City metro area and the proliferation of auxiliary devices (cell phones and pagers), 405 remained unchanged for over a quarter century. As of October 2017, 405 was projected to exhaust by the second quarter of 2021. At that time, an all-service overlay of 405 was recommended, which the

Oklahoma Corporation Commission The Oklahoma Corporation Commission is the public utilities commission of the U.S state of Oklahoma run by three statewide elected commissioners. Authorized to employ more than 400 employees, it regulates oil and gas drilling, utilities and tele ...

approved. On January 9, 2020 it was announced that area code 572 would overlay 405, and in January 2021

ten-digit dialing Ten-digit dialing is a telephone dialing procedure in the countries and territories that are members of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when dialing to initiate a telep ...

became mandatory in central Oklahoma. The new area code's assigned to new subscribers; anyone with an existing 405 number can keep it.

References

External links

List of exchanges from AreaCodeDownload.com, 405 Area Code
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405 __NOTOC__ Year 405 ( CDV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Stilicho and Anthemius (or, less frequently, year 1158 ''Ab ...

Telecommunications-related introductions in 1947 Oklahoma City metropolitan area