Reminder: 10-digit dialing required as of Saturday

Starting July 29, all calls made within western Washington will require dialing the 10-digit telephone number.

That's because a new area code — 564 — is being added in August.

New telephone numbers in the 206, 253 and 425 territories will be assigned a 564 area code, initially starting with the 360 area code territory.

Current telephone numbers won't change.

State regulators approved the new area code last year.

This story was originally published July 28, 2017 at 3:24 PM with the headline "Reminder: 10-digit dialing required as of Saturday."