[header] How to register to vote in washington [title] Find your driver's license or state identification card. [step] You will need this number in order to choose the online registration method. [substeps] If you do not have this card with a washington-issued id number on it, you will need to register by mail or in person with a different form of id. 
Online and mail voter registrations can be submitted up to 1 month before an election. In-person registrations can be completed up to 8 days before an election.