Find any 405- phone number in Oklahoma
The 405 area code is a telephone numbering plan code that serves the state of Oklahoma. This area code was created in 1953, and initially served the entire state. Additionally, it was named for the 405th area code created in the North American Numbering Plan.
The North American Numbering Plan is a system that assigns telephone area codes in order to assign phone numbers to different geographic locations. This system was implemented in 1947 in response to the growing need for phone numbers and the limited capacity of the original 3-digit system. Since then, the implementation of the 10-digit, 3 + 7 system has allowed phone companies to assign phone numbers even as demand is increasing. Each area code is assigned to a particular geographic region, with the 405 area code serving Oklahoma.