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405 Area Code Exhaust

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Frequently Asked Questions

Federal law requires the change to ensure the area currently served by the 405 area code does not run out of numbers.

Population growth, more people owning more devices, as well as computer-driven equipment such as just-in-time inventory systems all are increasing demand for phone numbers.

No. If you have a 405 number, you will keep it.

However, if you get a new number after May 24, 2021, you could be assigned the new 572 area code.

While you must dial 405 before making a local call, there will not be added long-distance charges for making calls on a landline within the area code served by 405.

Any equipment, including security systems, must be updated to include the 405 area code for dialing phone numbers.

Virtual Town Hall

The Oklahoma Corporation Commission's Public Utility Division hosted a Virtual Town Hall Meeting on November 6, 2019, to inform the public about the area code relief process in the 405 area code.

Regulatory Background

In Cause No. PUD 201800086, Neustar, Inc., the North American Numbering Plan Administrator ("NANPA"), in its role as the neutral third party NPA Relief Planner for Oklahoma under the North American Numbering Plan and on behalf of the Oklahoma Telecommunications Industry, petitioned the Oklahoma Corporation Commission for approval of the Industry's consensus decision to recommend to the Commission an all-services distributed overlay as the preferred form of relief for the 405 Numbering Plan Area ("NPA").

On January 8, 2020, the OCC ordered that an all-services distributed overlay shall be utilized to provide relief for the impending exhaust of the 405 NPA. The all-services distributed overlay area code is 572.

Overview of Dialing Changes


  • October 24, 2020 – Permissive 10-digit dialing began
  • April 24, 2021 – Mandatory 10-digit dialing began
  • May 24, 2021 – 572 area code added for new phone numbers

Will this affect the cost of local calls?

No, this change will not change how local calls are billed (i.e., local calls will remain local calls, regardless of whether the number dialed is a 405 or 572 area code).

Case Documents

Last Modified on Jun 12, 2023