OLYMPIA - Expect a postcard in the mail soon that encourages you to register in time for this fall's general election.

That's the word from state Elections Division officials, who are joining Washington's 39 county auditors to mail voter registration information to 210,000 eligible residents who haven't registered yet.

About one-third of the recipients are 18-year-olds and 60 percent are under 30. The postcards are being mailed through Sept. 24.

"We hope that citizens receiving the postcard will realize how easy it is to register online to vote here in Washington," Secretary of State Kim Wyman said.

Oct. 6 is the deadline for online or mail-in voter registrations and updates before the general election end date of Nov. 4. Oct. 27 is the last day to apply in person at a county elections office.

It's possible that some registered voters may also get the postcard, if their driver's license or state ID records do not exactly match an existing voter registration record.

The registration update and voter registration effort is possible through the state's participation in the Electronic Registration Information Center (ERIC), a nonprofit organization. It is governed and managed by states that choose to join.

Washington is one of seven states that formed ERIC in 2012. Currently, 12 states and the District of Columbia participate.