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405 Area Code Exhaust

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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 decives, 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

Regulatory Background: why is this needed?

In the Matter of a General Investigation Into the Exhaust of the 405 NPA:  Application of the North American Numbering Plan Administrator ("NANPA") on Behalf of the Oklahoma Telecommunications Industry

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 behalf of the Oklahoma Telecommunications Industry, petitions 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.


  • Oct. 24, 2020 – Permissive 10-digit dialing begins.
  • April 24, 2021 – Mandatory 10-digit dialing to begin. 
  • May 24,2021 – 572 area code added for new phone numbers

Will this affect how much local calls cost?

The 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). 

Learn more

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. 

A recording of this meeting is posted on the agency's Facebook page


Documents, case history

   Procedural Schedule

Date Action
September 25, 2019 Deadline for PUD to accomplish publication of notice of this Cause
October 2, 2019 Technical Advisory Group ("TAG") Meeting at 1:30 p.m. in Courtroom 301 of the Jim Thorpe Building
October 17, 2019 Direct Testimony to be filed
October 21, 2019 Statement of Position to be filed
October 31, 2019 Rebuttal Testimony to be filed, if any
November 20, 2019 Hearing on the Merits at 1:30 p.m. in Courtroom B
December 3, 2019 Proposed Findings of Fact & Conclusions of Law filed
January 7, 2020 Proposed ALJ Report due

Last Modified on Jul 26, 2021