July 4th is the last day to register to vote online or by mail in Washington if you want to cast a ballot in the August 2nd Primary Elections. While state and county offices will be closed on Monday, you can register online, as long as you have either a valid Washington Driver’s License, or Washington State ID Card. You also have until Monday to update your address or other information if you’re already registered. Go to the Secretary of State website to register online. You have until July 25th to register in person.