According to the North American Numbering Plan Administrator, the 206 area code numbers will run out by 2025.

Say hello to "564," Seattle. That's the new area code for phone numbers eventually coming online within the existing 206 region. The "206" area code currently covers Seattle, Vashon Island ...

It’s the end of an era. Or rather, the end of an area code. As the 206 area code is almost exhausted in Seattle, a new code will hit the city next month.