Mail ballots are due in the Hays County Elections Office, 712 S. Stagecoach Trail, San Marcos, on Election Day by 7 p.m. If they are mailed, they need to be postmarked by Election Day, November 5. On Election Day ONLY they can be delivered in person to the Elections Office. Questions? Click on the Elections icon above, or call the Elections Office at 512-393-7310 or email firstname.lastname@example.org.