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# Washington Area Code 564
The 564 area code is an overlay to southwestern Washington State, serving the same geographic region as the original 360 area code. Established in 2021, the 564 area code was created to address the growing demand for telephone numbers in this region, which includes cities such as Olympia, Tacoma, Vancouver, and Longview. The North American Numbering Plan (NANP) assigns area codes to geographic regions to organize the telephone numbering system across North America, ensuring that each phone number is unique and properly routed. When an area experiences exhaustion of available phone numbers within its original code, regulatory bodies introduce an overlay area code that covers the same territory, allowing new phone numbers to be issued without requiring existing customers to change their numbers.
The system that designates area codes like 564 involves careful planning and coordination between the Federal Communications Commission (FCC), state regulatory agencies, and telecommunications carriers. The NANP utilizes a hierarchical structure where three-digit area codes identify specific geographic regions, followed by a three-digit exchange code and a four-digit subscriber number. Before introducing a new overlay code, telecommunications administrators conduct detailed forecasting analyses to determine when a region will exhaust its available numbering resources. Once an overlay area code is approved and implemented, both the original and new area codes serve the same region simultaneously, and customers may be assigned phone numbers from either code regardless of their physical location. This system ensures that telephone service remains available and scalable as population and communication needs continue to grow.