Washington Utilities and Transportation Commission
Washington area code exhaust projections by the Federal Communications Commission (FCC) Numbering Plan Administrator
Area code exhaust projections are calculated by the FCC's North American Numbering Plan Administrator (NANPA). Communication service providers submit anticipated number resource use twice a year to the FCC. Those projections are calculated and then dates released by the FCC on when an area code will run out of numbers.
Inefficient allocation of prefixes without number pooling has been the main cause of area code exhaust nationwide. The UTC and federal regulators require service providers to use the existing supply of numbers efficiently through the following:
Number portability allows a customer to keep her telephone number when there is a change of service provider, location or service. The FCC (Order CC Docket 99-200) requires all service providers to port numbers.
In 2002, a plan to overlay the 509 area code with a second code (and require ten digit local dialing) in Eastern Washington was proposed by FCC representatives on behalf of communications service providers; however, the UTC dismissed the proposal and instead directed that efforts be focused on using the existing limited supply of number resources more efficiently.
* The original projection in 2015 was for 3Q 2017 and later updated to 1Q 2019; but now, as of March 25, 2016, the revised projection for area code (360) is 1Q 2018 via the NANP Administrator's Delta NRUF. The full 2016 exhaust projection report (which was most recently published in April 2016) confirms the Delta NRUF.