Lemon Grove Library. Courtesy of San Diego County

Mail ballots aren’t just for mailing, county official reminded Monday.

They also can be dropped off at the Registrar of Voters Office in Kearny Mesa or at 59 libraries throughout the county before Nov. 6, Election Day.

(But libraries are not for early voting, county officials say. Each mail ballot packet contains an insert with additional information about drop-off sites.)

Drop-off sites are open during regular business hours starting Monday, Oct. 29.

The high number of contests in the midterm election means San Diego County voters will be getting a two-card ballot, with races listed on the front and back of each card.

The quicker ballots are returned to the Registrar’s Office, the faster they can be prepared for counting Election Night, saving time and taxpayer dollars.

“More than 1.1 million San Diego County voters use mail ballots and that number continues to rise,” said Registrar Michael Vu. “The early drop-off sites are convenient for the voter, they help with the timely return of mail ballots and decrease the high volume of voters dropping off mail ballots at polling places on Election Day.”

Voters who’d like to apply for a mail ballot still have time to get one before the Tuesday, Oct. 30, deadline. They can visit sdvote.com or call (858) 565-5800.

Meantime, early voting is already under way at the Registrar of Voters Office at 5600 Overland Ave., San Diego, on the County Operations Center campus.

Voters can cast their ballots there from 8 a.m. to 5 p.m. Monday through Friday until Election Day when the voting hours will change to 7 a.m. to 8 p.m. to reflect the hours at the polls, or between 8 a.m. and 5 p.m. Saturday, Nov. 3 and Sunday, Nov. 4.