To ensure a continuing supply of telephone numbers, the new 564 area code has been added to the regions of Washington served by area codes 360, 206, 253, and 425. This is known as an area code overlay, and it'll require you to change the way you enter telephone numbers when making a call.

Washington area code boundaries and area code assignments

What is an area code overlay?

An overlay is the addition of another area code, 564, to the same geographic region as an existing area code(s), 360, 206, 253, and 425.

Note: An overlay doesn't require customers to change their existing area code or telephone number, but it will require all callers to enter 10 digits for local calls.

Who will be affected?

All of western Washington will be affected. The 564 area code overlay will be introduced initially in the 360 area code region, and then expanded to the 206, 253, and 425 area codes when they are nearing exhaust.

What will be the new dialing procedure?

To complete local calls in western Washington, the new dialing procedure requires callers to dial ten digits (area code + 7-digit telephone number). The same dialing procedure will apply to telephone numbers assigned to the new 564 area code.

When will the change begin?

  • Beginning January 28, 2017, you should begin using the new dialing procedures whenever you place a call from the 360, 206, 253, and 425 area codes. If you forget and dial just seven digits, your call will still be completed.
  • Beginning July 29, 2017, you must use the new dialing procedures, as described above for all calls. After this date, if you don't use the new dialing procedures, your calls will not be completed, and a recording will instruct you to hang up and dial again.
  • Beginning August 28, 2017, new telephone lines or services may be assigned numbers using the new 564 area code.

What will you need to do?

In addition to changing your dialing procedures, all services, automatic dialing equipment, or other types of equipment that are programmed with a 7-digit number will need to be reprogrammed to use the new dialing procedures. This includes life safety systems, PBXs, mobile phone contact lists, fax machines, internet dial-up numbers, alarm and security systems, gates, speed dialers, call forwarding settings, voicemail services, etc.

You'll also want to update your personal contact information, including pet ID tags, personal ID tags, and business cards to ensure the correct area code is included.

What will remain the same?

  • Your telephone number, including current area code.
  • The price of a call, coverage area, or other rates and services.
  • Current local calls will remain a local call regardless of the number of digits entered.
  • You'll still need to enter 1 + area code + 7-digit telephone number for long-distance calls.
  • You can still enter just three digits to reach 911.
  • If 211, 311, 411, 511, 611, 711 or 811 are currently available in your community, you'll still enter these codes with just three digits.

For additional information, contact us or refer to the customer letter below:

Washington 564 Area Code Overlay Customer Letter